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</div> </div> </div> <p class="title is-5 mathjax"> Development and Implementation of Advanced Beam Diagnostic and Abort Systems in SuperKEKB </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Yoshihara%2C+K">Keisuke Yoshihara</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+T">Tetsuro Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Aversano%2C+M">Michele Aversano</a>, <a href="/search/hep-ex?searchtype=author&query=Gale%2C+A">Alexander Gale</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">Hitomi Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Kaji%2C+H">Hiroshi Kaji</a>, <a href="/search/hep-ex?searchtype=author&query=Kakuno%2C+H">Hidekazu Kakuno</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+T">Taichiro Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Iijima%2C+T">Toru Iijima</a>, <a href="/search/hep-ex?searchtype=author&query=Kato%2C+S">Shinnosuke Kato</a>, <a href="/search/hep-ex?searchtype=author&query=Kusudo%2C+A">Ami Kusudo</a>, <a href="/search/hep-ex?searchtype=author&query=Liu%2C+Y">Yuxin Liu</a>, <a href="/search/hep-ex?searchtype=author&query=Maeda%2C+A">Akane Maeda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitra%2C+S">Sayan Mitra</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsuka%2C+G">Gaku Mitsuka</a>, <a href="/search/hep-ex?searchtype=author&query=Miyabayashi%2C+K">Kenkichi Miyabayashi</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+I">Isamu Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Nakayama%2C+H">Hiroyuki Nakayama</a>, <a href="/search/hep-ex?searchtype=author&query=Nakazawa%2C+Y">Yu Nakazawa</a>, <a href="/search/hep-ex?searchtype=author&query=Nomaru%2C+R">Riku Nomaru</a>, <a href="/search/hep-ex?searchtype=author&query=Okada%2C+I">Iori Okada</a>, <a href="/search/hep-ex?searchtype=author&query=Shi%2C+X">Xiao-Dong Shi</a>, <a href="/search/hep-ex?searchtype=author&query=Tanaka%2C+S">Shuji Tanaka</a>, <a href="/search/hep-ex?searchtype=author&query=Uno%2C+K">Kenta Uno</a>, <a href="/search/hep-ex?searchtype=author&query=Ushiroda%2C+Y">Yutaka Ushiroda</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.16184v2-abstract-short" style="display: inline;"> The SuperKEKB/Belle II experiment aims to collect high-statistics data of B meson pairs to explore new physics beyond the Standard Model (SM). SuperKEKB, an upgraded version of the KEKB accelerator, has achieved a world-record luminosity of $4.71 \times 10^{34} \, \mathrm{cm^{-2}s^{-1}}$ in 2022 but continues to strive for higher luminosities. One of the major obstacles is Sudden Beam Loss (SBL) e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.16184v2-abstract-full').style.display = 'inline'; document.getElementById('2408.16184v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.16184v2-abstract-full" style="display: none;"> The SuperKEKB/Belle II experiment aims to collect high-statistics data of B meson pairs to explore new physics beyond the Standard Model (SM). SuperKEKB, an upgraded version of the KEKB accelerator, has achieved a world-record luminosity of $4.71 \times 10^{34} \, \mathrm{cm^{-2}s^{-1}}$ in 2022 but continues to strive for higher luminosities. One of the major obstacles is Sudden Beam Loss (SBL) events, which cause substantial beam losses and damage to the Belle~II detector. To find a hint for addressing SBL challenges, advanced beam diagnostic systems and enhanced beam abort systems have been developed. The diagnostic system aims to accurately pinpoint the start of beam losses, while the upgraded abort system quickly disposes of anomalous beams to minimize damage. This paper details the development and implementation of these systems, including high-speed loss monitors, time synchronization with the White Rabbit system, and data acquisition systems. Efforts to understand the mechanisms of SBL events, using acoustic sensors to detect discharges, are also discussed. These measures aim to improve the operational stability and luminosity of SuperKEKB, contributing to the experiment's success. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.16184v2-abstract-full').style.display = 'none'; document.getElementById('2408.16184v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 25 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl. Instrum. Methods A, Vol. 170117, 2024 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.11438">arXiv:2406.11438</a> <span> [<a href="https://arxiv.org/pdf/2406.11438">pdf</a>, <a href="https://arxiv.org/format/2406.11438">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Search for Majorana Neutrinos with the Complete KamLAND-Zen Dataset </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Araki%2C+T">T. Araki</a>, <a href="/search/hep-ex?searchtype=author&query=Chiba%2C+K">K. Chiba</a>, <a href="/search/hep-ex?searchtype=author&query=Eda%2C+T">T. Eda</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Funahashi%2C+Y">Y. Funahashi</a>, <a href="/search/hep-ex?searchtype=author&query=Furuto%2C+A">A. Furuto</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+S">S. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Marthe%2C+A">A. Marthe</a>, <a href="/search/hep-ex?searchtype=author&query=Matsumoto%2C+Y">Y. Matsumoto</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a> , et al. (48 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.11438v1-abstract-short" style="display: inline;"> We present a search for neutrinoless double-beta ($0谓尾尾$) decay of $^{136}$Xe using the full KamLAND-Zen 800 dataset with 745 kg of enriched xenon, corresponding to an exposure of $2.097$ ton yr of $^{136}$Xe. This updated search benefits from a more than twofold increase in exposure, recovery of photo-sensor gain, and reduced background from muon-induced spallation of xenon. Combining with the se… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.11438v1-abstract-full').style.display = 'inline'; document.getElementById('2406.11438v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.11438v1-abstract-full" style="display: none;"> We present a search for neutrinoless double-beta ($0谓尾尾$) decay of $^{136}$Xe using the full KamLAND-Zen 800 dataset with 745 kg of enriched xenon, corresponding to an exposure of $2.097$ ton yr of $^{136}$Xe. This updated search benefits from a more than twofold increase in exposure, recovery of photo-sensor gain, and reduced background from muon-induced spallation of xenon. Combining with the search in the previous KamLAND-Zen phase, we obtain a lower limit for the $0谓尾尾$ decay half-life of $T_{1/2}^{0谓} > 3.8 \times 10^{26}$ yr at 90% C.L., a factor of 1.7 improvement over the previous limit. The corresponding upper limits on the effective Majorana neutrino mass are in the range 28-122 meV using phenomenological nuclear matrix element calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.11438v1-abstract-full').style.display = 'none'; document.getElementById('2406.11438v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">arXiv admin note: text overlap with arXiv:2203.02139</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.09920">arXiv:2404.09920</a> <span> [<a href="https://arxiv.org/pdf/2404.09920">pdf</a>, <a href="https://arxiv.org/format/2404.09920">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/1538-4357/ad5fee">10.3847/1538-4357/ad5fee <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Combined Pre-Supernova Alert System with Kamland and Super-Kamiokande </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=KamLAND"> KamLAND</a>, <a href="/search/hep-ex?searchtype=author&query=Collaborations%2C+S">Super-Kamiokande Collaborations</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">Seisho Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">Minori Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">Sawako Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">Azusa Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Yoshihito Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+S">Shun Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">Takahiko Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">Kazumi Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">Koichi Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">Sei Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">Haruo Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">Kunio Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">Koji Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Yuto Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">Nanami Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Yasuhiro Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">Masayuki Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">Maho Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">Tadao Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">Haruhiko Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Morita%2C+D">Daisuke Morita</a>, <a href="/search/hep-ex?searchtype=author&query=Nakahata%2C+T">Takeshi Nakahata</a> , et al. (290 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.09920v3-abstract-short" style="display: inline;"> Preceding a core-collapse supernova, various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potentially detectable by terrestrial neutrino experiments such as KamLAND and Super-Kamiokande via inverse beta decay interactions. Once these pre-supernova neutrinos are ob… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.09920v3-abstract-full').style.display = 'inline'; document.getElementById('2404.09920v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.09920v3-abstract-full" style="display: none;"> Preceding a core-collapse supernova, various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potentially detectable by terrestrial neutrino experiments such as KamLAND and Super-Kamiokande via inverse beta decay interactions. Once these pre-supernova neutrinos are observed, an early warning of the upcoming core-collapse supernova can be provided. In light of this, KamLAND and Super-Kamiokande, both located in the Kamioka mine in Japan, have been monitoring pre-supernova neutrinos since 2015 and 2021, respectively. Recently, we performed a joint study between KamLAND and Super-Kamiokande on pre-supernova neutrino detection. A pre-supernova alert system combining the KamLAND detector and the Super-Kamiokande detector was developed and put into operation, which can provide a supernova alert to the astrophysics community. Fully leveraging the complementary properties of these two detectors, the combined alert is expected to resolve a pre-supernova neutrino signal from a 15 M$_{\odot}$ star within 510 pc of the Earth, at a significance level corresponding to a false alarm rate of no more than 1 per century. For a Betelgeuse-like model with optimistic parameters, it can provide early warnings up to 12 hours in advance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.09920v3-abstract-full').style.display = 'none'; document.getElementById('2404.09920v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Resubmitted to ApJ. 22 pages, 16 figures, for more information about the combined pre-supernova alert system, see https://www.lowbg.org/presnalarm/</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.08786">arXiv:2402.08786</a> <span> [<a href="https://arxiv.org/pdf/2402.08786">pdf</a>, <a href="https://arxiv.org/format/2402.08786">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Present status of PICOLON project </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Fushimi%2C+K">K. Fushimi</a>, <a href="/search/hep-ex?searchtype=author&query=Chernyak%2C+D">D. Chernyak</a>, <a href="/search/hep-ex?searchtype=author&query=Ejiri%2C+H">H. Ejiri</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hazama%2C+R">R. Hazama</a>, <a href="/search/hep-ex?searchtype=author&query=Iida%2C+T">T. Iida</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Imagawa%2C+K">K. Imagawa</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ito%2C+H">H. Ito</a>, <a href="/search/hep-ex?searchtype=author&query=Kisimoto%2C+T">T. Kisimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kotera%2C+K">K. Kotera</a>, <a href="/search/hep-ex?searchtype=author&query=Kozlov%2C+A">A. Kozlov</a>, <a href="/search/hep-ex?searchtype=author&query=Kurosawa%2C+S">S. Kurosawa</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Orito%2C+R">R. Orito</a>, <a href="/search/hep-ex?searchtype=author&query=Sakaguchi%2C+A">A. Sakaguchi</a>, <a href="/search/hep-ex?searchtype=author&query=Sakaue%2C+A">A. Sakaue</a>, <a href="/search/hep-ex?searchtype=author&query=Shima%2C+T">T. Shima</a>, <a href="/search/hep-ex?searchtype=author&query=Takaku%2C+Y">Y. Takaku</a>, <a href="/search/hep-ex?searchtype=author&query=Takemoto%2C+Y">Y. Takemoto</a>, <a href="/search/hep-ex?searchtype=author&query=Umehara%2C+S">S. Umehara</a>, <a href="/search/hep-ex?searchtype=author&query=Urano%2C+Y">Y. Urano</a>, <a href="/search/hep-ex?searchtype=author&query=Yamamoto%2C+Y">Y. Yamamoto</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.08786v1-abstract-short" style="display: inline;"> The existence of cosmic dark matter and neutrino properties are long-standing problems in cosmology and particle physics. These problems have been investigated by using radiation detectors. We will discuss the application of inorganic crystal scintillators to studies on dark matter and neutrino properties. A large volume and high-purity inorganic crystal is a promising detector for investigating d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.08786v1-abstract-full').style.display = 'inline'; document.getElementById('2402.08786v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.08786v1-abstract-full" style="display: none;"> The existence of cosmic dark matter and neutrino properties are long-standing problems in cosmology and particle physics. These problems have been investigated by using radiation detectors. We will discuss the application of inorganic crystal scintillators to studies on dark matter and neutrino properties. A large volume and high-purity inorganic crystal is a promising detector for investigating dark matter and neutrino. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.08786v1-abstract-full').style.display = 'none'; document.getElementById('2402.08786v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proceedings of the 37th Workshop on Radiation Detectors and Their Uses, KEK Proceedings 2023-1, (2024), p43 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.09676">arXiv:2311.09676</a> <span> [<a href="https://arxiv.org/pdf/2311.09676">pdf</a>, <a href="https://arxiv.org/format/2311.09676">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2024.138846">10.1016/j.physletb.2024.138846 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Charged Excited States of Dark Matter with KamLAND-Zen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+K">KamLAND-Zen collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+S">S. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Morita%2C+D">D. Morita</a>, <a href="/search/hep-ex?searchtype=author&query=Nakahata%2C+T">T. Nakahata</a> , et al. (44 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.09676v2-abstract-short" style="display: inline;"> Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter ($蠂^{0}$) accompanied by a negatively charged excited state ($蠂^{-}$) with a small mass difference (e.g. $<$ 20 MeV) can form a bound-state with a nucleus such as xenon. This bound-state formation is rare and the released energy is $\mathcal{O}(1-10$) MeV depending on the nucleus, making… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.09676v2-abstract-full').style.display = 'inline'; document.getElementById('2311.09676v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.09676v2-abstract-full" style="display: none;"> Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter ($蠂^{0}$) accompanied by a negatively charged excited state ($蠂^{-}$) with a small mass difference (e.g. $<$ 20 MeV) can form a bound-state with a nucleus such as xenon. This bound-state formation is rare and the released energy is $\mathcal{O}(1-10$) MeV depending on the nucleus, making large liquid scintillator detectors suitable for detection. We searched for bound-state formation events with xenon in two experimental phases of the KamLAND-Zen experiment, a xenon-doped liquid scintillator detector. No statistically significant events were observed. For a benchmark parameter set of WIMP mass $m_{蠂^{0}} = 1$ TeV and mass difference $螖m = 17$ MeV, we set the most stringent upper limits on the recombination cross section times velocity $\langle蟽v\rangle$ and the decay-width of $蠂^{-}$ to $9.2 \times 10^{-30}$ ${\rm cm^3/s}$ and $8.7 \times 10^{-14}$ GeV, respectively at 90% confidence level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.09676v2-abstract-full').style.display = 'none'; document.getElementById('2311.09676v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 855 (2024) 138846 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.09307">arXiv:2301.09307</a> <span> [<a href="https://arxiv.org/pdf/2301.09307">pdf</a>, <a href="https://arxiv.org/format/2301.09307">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.09307v1-abstract-short" style="display: inline;"> Cosmic-ray muons produce various radioisotopes when passing through material. These spallation products can be backgrounds for rare event searches such as in solar neutrino, double-beta decay, and dark matter search experiments. The KamLAND-Zen experiment searches for neutrinoless double-beta decay in 745kg of xenon dissolved in liquid scintillator. The experiment includes dead-time-free electroni… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.09307v1-abstract-full').style.display = 'inline'; document.getElementById('2301.09307v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.09307v1-abstract-full" style="display: none;"> Cosmic-ray muons produce various radioisotopes when passing through material. These spallation products can be backgrounds for rare event searches such as in solar neutrino, double-beta decay, and dark matter search experiments. The KamLAND-Zen experiment searches for neutrinoless double-beta decay in 745kg of xenon dissolved in liquid scintillator. The experiment includes dead-time-free electronics with a high efficiency for detecting muon-induced neutrons. The production yields of different radioisotopes are measured with a combination of delayed coincidence techniques, newly developed muon reconstruction and xenon spallation identification methods. The observed xenon spallation products are consistent with results from the FLUKA and Geant4 simulation codes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.09307v1-abstract-full').style.display = 'none'; document.getElementById('2301.09307v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.13911">arXiv:2211.13911</a> <span> [<a href="https://arxiv.org/pdf/2211.13911">pdf</a>, <a href="https://arxiv.org/format/2211.13911">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.107.072006">10.1103/PhysRevD.107.072006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=KamLAND+Collaboration"> KamLAND Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Nakahata%2C+T">T. Nakahata</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a> , et al. (39 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.13911v2-abstract-short" style="display: inline;"> We report a measurement of the strange axial coupling constant $g_A^s$ using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of $g_A^s$ significantly changes the ratio of proton and neutron NCQE cross sections. KamLAND is suitable for measuring NCQE interactions as it can detect nucleon re… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.13911v2-abstract-full').style.display = 'inline'; document.getElementById('2211.13911v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.13911v2-abstract-full" style="display: none;"> We report a measurement of the strange axial coupling constant $g_A^s$ using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of $g_A^s$ significantly changes the ratio of proton and neutron NCQE cross sections. KamLAND is suitable for measuring NCQE interactions as it can detect nucleon recoils with low-energy thresholds and measure neutron multiplicity with high efficiency. KamLAND data, including the information on neutron multiplicity associated with the NCQE interactions, makes it possible to measure $g_A^s$ with a suppressed dependence on the axial mass $M_A$, which has not yet been determined. For a comprehensive prediction of the neutron emission associated with neutrino interactions, we establish a simulation of particle emission via nuclear deexcitation of $^{12}$C, a process not considered in existing neutrino Monte Carlo event generators. Energy spectrum fitting for each neutron multiplicity gives $g_A^s =-0.14^{+0.25}_{-0.26}$, which is the most stringent limit obtained using NCQE interactions without $M_A$ constraints. The two-body current contribution considered in this analysis relies on a theoretically effective model and electron scattering experiments and requires future verification by direct measurements and future model improvement. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.13911v2-abstract-full').style.display = 'none'; document.getElementById('2211.13911v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 April, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 107,072006 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.14934">arXiv:2205.14934</a> <span> [<a href="https://arxiv.org/pdf/2205.14934">pdf</a>, <a href="https://arxiv.org/format/2205.14934">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Geophysics">physics.geo-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1029/2022GL099566">10.1029/2022GL099566 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Abundances of uranium and thorium elements in Earth estimated by geoneutrino spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Maemura%2C+N">N. Maemura</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Nakahata%2C+T">T. Nakahata</a> , et al. (43 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.14934v2-abstract-short" style="display: inline;"> The decay of the primordial isotopes $^{238}\mathrm{U}$, $^{235}\mathrm{U}$, $^{232}\mathrm{Th}$, and $^{40}\mathrm{K}$ have contributed to the terrestrial heat budget throughout the Earth's history. Hence the individual abundance of those isotopes are key parameters in reconstructing contemporary Earth model. The geoneutrinos produced by the radioactive decays of uranium and thorium have been obs… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.14934v2-abstract-full').style.display = 'inline'; document.getElementById('2205.14934v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.14934v2-abstract-full" style="display: none;"> The decay of the primordial isotopes $^{238}\mathrm{U}$, $^{235}\mathrm{U}$, $^{232}\mathrm{Th}$, and $^{40}\mathrm{K}$ have contributed to the terrestrial heat budget throughout the Earth's history. Hence the individual abundance of those isotopes are key parameters in reconstructing contemporary Earth model. The geoneutrinos produced by the radioactive decays of uranium and thorium have been observed with the Kamioka Liquid-Scintillator Antineutrino Detector (KamLAND). Those measurements have been improved with more than 18-year observation time, and improvements in detector background levels mainly by an 8-year almost rector-free period now permit spectroscopy with geoneutrinos. Our results yield the first constraint on both uranium and thorium heat contributions. Herein the KamLAND result is consistent with geochemical estimations based on elemental abundances of chondritic meteorites and mantle peridotites. The High-Q model is disfavored at 99.76% C.L. and a fully radiogenic model is excluded at 5.2$蟽$ assuming a homogeneous heat producing element distribution in the mantle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.14934v2-abstract-full').style.display = 'none'; document.getElementById('2205.14934v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 2 figures, accepted for publication in Geophysical Research Letters on Aug 4th, 2022</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Geophysical Research Letters, Volume 49, Issue 16, e2022GL099566 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2204.12065">arXiv:2204.12065</a> <span> [<a href="https://arxiv.org/pdf/2204.12065">pdf</a>, <a href="https://arxiv.org/format/2204.12065">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/1538-4357/ac7a3f">10.3847/1538-4357/ac7a3f <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for supernova neutrinos and constraint on the galactic star formation rate with the KamLAND data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Maemura%2C+N">N. Maemura</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Nakahata%2C+T">T. Nakahata</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2204.12065v3-abstract-short" style="display: inline;"> We present the results of a search for core-collapse supernova neutrinos, using long-term KamLAND data from 2002 March 9 to 2020 April 25. We focus on the electron antineutrinos emitted from supernovae in the energy range of 1.8--111 MeV. Supernovae will make a neutrino event cluster with the duration of $\sim$10 s in the KamLAND data. We find no neutrino clusters and give the upper limit on the s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.12065v3-abstract-full').style.display = 'inline'; document.getElementById('2204.12065v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2204.12065v3-abstract-full" style="display: none;"> We present the results of a search for core-collapse supernova neutrinos, using long-term KamLAND data from 2002 March 9 to 2020 April 25. We focus on the electron antineutrinos emitted from supernovae in the energy range of 1.8--111 MeV. Supernovae will make a neutrino event cluster with the duration of $\sim$10 s in the KamLAND data. We find no neutrino clusters and give the upper limit on the supernova rate as to be 0.15 yr$^{-1}$ with a 90% confidence level. The detectable range, which corresponds to a >95% detection probability, is 40--59 kpc and 65--81 kpc for core-collapse supernovae and failed core-collapse supernovae, respectively. This paper proposes to convert the supernova rate obtained by the neutrino observation to the Galactic star formation rate. Assuming a modified Salpeter-type initial mass function, the upper limit on the Galactic star formation rate is <(17.5--22.7) $M_{\odot} \mathrm{yr}^{-1}$ with a 90% confidence level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2204.12065v3-abstract-full').style.display = 'none'; document.getElementById('2204.12065v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 April, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 4 figures, accepted for publication in Astrophysical Journal</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> The Astrophysical Journal, Volume 934, Number 1, Page 85 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.02139">arXiv:2203.02139</a> <span> [<a href="https://arxiv.org/pdf/2203.02139">pdf</a>, <a href="https://arxiv.org/format/2203.02139">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.130.051801">10.1103/PhysRevLett.130.051801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Maemura%2C+N">N. Maemura</a> , et al. (50 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.02139v2-abstract-short" style="display: inline;"> The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta ($0谓尾尾$) decay half-life in $^{136}$Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of $^{136}$Xe. These new data provide valuable… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.02139v2-abstract-full').style.display = 'inline'; document.getElementById('2203.02139v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.02139v2-abstract-full" style="display: none;"> The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta ($0谓尾尾$) decay half-life in $^{136}$Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of $^{136}$Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the $0谓尾尾$ decay half-life of $T_{1/2}^{0谓} > 2.3 \times 10^{26}$ yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.02139v2-abstract-full').style.display = 'none'; document.getElementById('2203.02139v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 130, 051801 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.04918">arXiv:2112.04918</a> <span> [<a href="https://arxiv.org/pdf/2112.04918">pdf</a>, <a href="https://arxiv.org/format/2112.04918">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/1538-4357/ac4e7e">10.3847/1538-4357/ac4e7e <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A search for correlated low-energy electron antineutrinos in KamLAND with gamma-ray bursts </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Kinoshita%2C+T">T. Kinoshita</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Maemura%2C+N">N. Maemura</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+R">R. Nakamura</a> , et al. (43 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.04918v2-abstract-short" style="display: inline;"> We present the results of a time-coincident event search for low-energy electron antineutrinos in the KamLAND detector with gamma-ray bursts from the Gamma-ray Coordinates Network and Fermi Gamma-ray Burst Monitor. Using a variable coincidence time window of $\pm$500s plus the duration of each gamma-ray burst, no statistically significant excess above background is observed. We place the world's m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.04918v2-abstract-full').style.display = 'inline'; document.getElementById('2112.04918v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.04918v2-abstract-full" style="display: none;"> We present the results of a time-coincident event search for low-energy electron antineutrinos in the KamLAND detector with gamma-ray bursts from the Gamma-ray Coordinates Network and Fermi Gamma-ray Burst Monitor. Using a variable coincidence time window of $\pm$500s plus the duration of each gamma-ray burst, no statistically significant excess above background is observed. We place the world's most stringent 90% confidence level upper limit on the electron antineutrino fluence below 17.5 MeV. Assuming a Fermi-Dirac neutrino energy spectrum from the gamma-ray burst source, we use the available redshift data to constrain the electron antineutrino luminosity and effective temperature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.04918v2-abstract-full').style.display = 'none'; document.getElementById('2112.04918v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.08527">arXiv:2108.08527</a> <span> [<a href="https://arxiv.org/pdf/2108.08527">pdf</a>, <a href="https://arxiv.org/format/2108.08527">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/1538-4357/ac32c1">10.3847/1538-4357/ac32c1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limits on astrophysical antineutrinos with the KamLAND experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kinoshita%2C+T">T. Kinoshita</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Maemura%2C+N">N. Maemura</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.08527v3-abstract-short" style="display: inline;"> We report on a search for electron antineutrinos ($\bar谓_e$) from astrophysical sources in the neutrino energy range 8.3 to 30.8 MeV with the KamLAND detector. In an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candidate events via the inverse beta decay reaction. Although there is a large background uncertainty from neutral current atmospheric neutrino interactions, we fin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.08527v3-abstract-full').style.display = 'inline'; document.getElementById('2108.08527v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.08527v3-abstract-full" style="display: none;"> We report on a search for electron antineutrinos ($\bar谓_e$) from astrophysical sources in the neutrino energy range 8.3 to 30.8 MeV with the KamLAND detector. In an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candidate events via the inverse beta decay reaction. Although there is a large background uncertainty from neutral current atmospheric neutrino interactions, we find no significant excess over background model predictions. Assuming several supernova relic neutrino spectra, we give upper flux limits of 60--110 cm$^{-2}$ s$^{-1}$ (90% CL) in the analysis range and present a model-independent flux. We also set limits on the annihilation rates for light dark matter pairs to neutrino pairs. These data improves on the upper probability limit of $^{8}$B solar neutrinos converting into $\bar谓_e$'s, $P_{谓_e \rightarrow \bar谓_e} < 3.5\times10^{-5}$ (90% CL) assuming an undistorted $\bar谓_e$ shape. This corresponds to a solar $\bar谓_e$ flux of 60 cm$^{-2}$ s$^{-1}$ (90% CL) in the analysis energy range. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.08527v3-abstract-full').style.display = 'none'; document.getElementById('2108.08527v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 9 figures, 4 tables, accepted for publication in Astrophysical Journal</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> The Astrophysical Journal, Volume 925, Number 1, Page 14 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.10452">arXiv:2104.10452</a> <span> [<a href="https://arxiv.org/pdf/2104.10452">pdf</a>, <a href="https://arxiv.org/format/2104.10452">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/16/08/p08023">10.1088/1748-0221/16/08/p08023 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The nylon balloon for xenon loaded liquid scintillator in KamLAND-Zen 800 neutrinoless double-beta decay search experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+K">KamLAND-Zen collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Nakada%2C+T">T. Nakada</a>, <a href="/search/hep-ex?searchtype=author&query=Obara%2C+S">S. Obara</a>, <a href="/search/hep-ex?searchtype=author&query=Ozaki%2C+H">H. Ozaki</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashi%2C+A">A. Hayashi</a>, <a href="/search/hep-ex?searchtype=author&query=Honda%2C+Y">Y. Honda</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+S">S. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kamizawa%2C+K">K. Kamizawa</a> , et al. (49 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.10452v3-abstract-short" style="display: inline;"> The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of $^{136}$Xe by using $^{136}$Xe-loaded liquid scintillator. The liquid scintillator is enclosed inside a balloon made of thin, transparent, low-radioactivity film that we call Inner Balloon (IB). The IB, apart from guaranteeing the liquid containment, also allows to minimize the background from cosmogenic muon-spa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.10452v3-abstract-full').style.display = 'inline'; document.getElementById('2104.10452v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.10452v3-abstract-full" style="display: none;"> The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of $^{136}$Xe by using $^{136}$Xe-loaded liquid scintillator. The liquid scintillator is enclosed inside a balloon made of thin, transparent, low-radioactivity film that we call Inner Balloon (IB). The IB, apart from guaranteeing the liquid containment, also allows to minimize the background from cosmogenic muon-spallation products and $^{8}$B solar neutrinos. Indeed these events could contribute to the total counts in the region of interest around the Q-value of the double-beta decay of $^{136}$Xe. In this paper, we present an overview of the IB and describe the various steps of its commissioning minimizing the radioactive contaminations, from the material selection, to the fabrication of the balloon and its installation inside the KamLAND detector. Finally, we show the impact of the IB on the KamLAND background as measured by the KamLAND detector itself. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.10452v3-abstract-full').style.display = 'none'; document.getElementById('2104.10452v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 16 figures, to be submitted to JINST</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> 2021 JINST 16 P08023 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2101.06049">arXiv:2101.06049</a> <span> [<a href="https://arxiv.org/pdf/2101.06049">pdf</a>, <a href="https://arxiv.org/ps/2101.06049">ps</a>, <a href="https://arxiv.org/format/2101.06049">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kinoshita%2C+T">T. Kinoshita</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Maemura%2C+N">N. Maemura</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+R">R. Nakamura</a> , et al. (47 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2101.06049v1-abstract-short" style="display: inline;"> There are many theories where a dark matter particle is part of a multiplet with an electrically charged state. If WIMP dark matter ($蠂^{0}$) is accompanied by a charged excited state ($蠂^{-}$) separated by a small mass difference, it can form a stable bound state with a nucleus. In supersymmetric models, the $蠂^{0}$ and the $蠂^{-}$ could be the neutralino and a charged slepton, such as the neutra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.06049v1-abstract-full').style.display = 'inline'; document.getElementById('2101.06049v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2101.06049v1-abstract-full" style="display: none;"> There are many theories where a dark matter particle is part of a multiplet with an electrically charged state. If WIMP dark matter ($蠂^{0}$) is accompanied by a charged excited state ($蠂^{-}$) separated by a small mass difference, it can form a stable bound state with a nucleus. In supersymmetric models, the $蠂^{0}$ and the $蠂^{-}$ could be the neutralino and a charged slepton, such as the neutralino-stau degenerate model. The formation binding process is expected to result in an energy deposition of {\it O}(1--10 MeV), making it suitable for detection in large liquid scintillator detectors. We describe new constraints on the bound state formation with a xenon nucleus using the KamLAND-Zen 400 Phase-II dataset. In order to enlarge the searchable parameter space, all xenon isotopes in the detector were used. For a benchmark parameter set of $m_{蠂^{0}} = 100$ GeV and $螖m = 10$ MeV, this study sets the most stringent upper limits on the recombination cross section $\langle蟽v\rangle$ and the decay-width of $蠂^{-}$ of $2.0 \times 10^{-31}$ ${\rm cm^3/s}$ and $1.1 \times 10^{-18}$ GeV, respectively (90\% confidence level). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2101.06049v1-abstract-full').style.display = 'none'; document.getElementById('2101.06049v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.12053">arXiv:2012.12053</a> <span> [<a href="https://arxiv.org/pdf/2012.12053">pdf</a>, <a href="https://arxiv.org/format/2012.12053">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/1538-4357/abd5bc">10.3847/1538-4357/abd5bc <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Kinoshita%2C+T">T. Kinoshita</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Maemura%2C+N">N. Maemura</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a> , et al. (44 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2012.12053v1-abstract-short" style="display: inline;"> We present the results of a search for MeV-scale electron antineutrino events in KamLAND in coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo collaboration during their second and third observing runs. We find no significant coincident signals within a $\pm$ 500 s timing window from each gravitational wave and present 90% C.L. upper limits on the electron antin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.12053v1-abstract-full').style.display = 'inline'; document.getElementById('2012.12053v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.12053v1-abstract-full" style="display: none;"> We present the results of a search for MeV-scale electron antineutrino events in KamLAND in coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo collaboration during their second and third observing runs. We find no significant coincident signals within a $\pm$ 500 s timing window from each gravitational wave and present 90% C.L. upper limits on the electron antineutrino fluence between $10^{8}$-$10^{13}\,{\mathrm cm^2}$ for neutrino energies in the energy range of 1.8-111 MeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.12053v1-abstract-full').style.display = 'none'; document.getElementById('2012.12053v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 2 figures, 2 tables, Accepted for publication in ApJ</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> The Astrophysical Journal, Volume 909, Number 2 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.00158">arXiv:2009.00158</a> <span> [<a href="https://arxiv.org/pdf/2009.00158">pdf</a>, <a href="https://arxiv.org/format/2009.00158">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2020.164575">10.1016/j.nima.2020.164575 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of a Low-noise Front-end ASIC for CdTe Detectors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Kawamura%2C+T">Tenyo Kawamura</a>, <a href="/search/hep-ex?searchtype=author&query=Orita%2C+T">Tadashi Orita</a>, <a href="/search/hep-ex?searchtype=author&query=Takeda%2C+S">Shin'ichiro Takeda</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+S">Shin Watanabe</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">Hirokazu Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Takahashi%2C+T">Tadayuki Takahashi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.00158v1-abstract-short" style="display: inline;"> We present our latest ASIC, which is used for the readout of Cadmium Telluride double-sided strip detectors (CdTe DSDs) and high spectroscopic imaging. It is implemented in a 0.35 um CMOS technology (X-Fab XH035), consists of 64 readout channels, and has a function that performs simultaneous AD conversion for each channel. The equivalent noise charge of 54.9 e- +/- 11.3 e- (rms) is measured withou… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.00158v1-abstract-full').style.display = 'inline'; document.getElementById('2009.00158v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.00158v1-abstract-full" style="display: none;"> We present our latest ASIC, which is used for the readout of Cadmium Telluride double-sided strip detectors (CdTe DSDs) and high spectroscopic imaging. It is implemented in a 0.35 um CMOS technology (X-Fab XH035), consists of 64 readout channels, and has a function that performs simultaneous AD conversion for each channel. The equivalent noise charge of 54.9 e- +/- 11.3 e- (rms) is measured without connecting the ASIC to any detectors. From the spectroscopy measurements using a CdTe single-sided strip detector, the energy resolution of 1.12 keV (FWHM) is obtained at 13.9 keV, and photons within the energy from 6.4 keV to 122.1 keV are detected. Based on the experimental results, we propose a new low-noise readout architecture making use of a slew-rate limited mode at the shaper followed by a peak detector circuit. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.00158v1-abstract-full').style.display = 'none'; document.getElementById('2009.00158v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 10 figures, accepted for publication in Nuclear Inst. and Methods in Physics Research, A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.13087">arXiv:1910.13087</a> <span> [<a href="https://arxiv.org/pdf/1910.13087">pdf</a>, <a href="https://arxiv.org/format/1910.13087">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/15/04/P04027">10.1088/1748-0221/15/04/P04027 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Performance evaluation of a silicon strip detector for positrons/electrons from a pulsed a muon beam </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aoyagi%2C+T">T. Aoyagi</a>, <a href="/search/hep-ex?searchtype=author&query=Honda%2C+Y">Y. Honda</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeno%2C+M">M. Ikeno</a>, <a href="/search/hep-ex?searchtype=author&query=Kawagoe%2C+K">K. Kawagoe</a>, <a href="/search/hep-ex?searchtype=author&query=Kohriki%2C+T">T. Kohriki</a>, <a href="/search/hep-ex?searchtype=author&query=Kume%2C+T">T. Kume</a>, <a href="/search/hep-ex?searchtype=author&query=Mibe%2C+T">T. Mibe</a>, <a href="/search/hep-ex?searchtype=author&query=Namba%2C+K">K. Namba</a>, <a href="/search/hep-ex?searchtype=author&query=Nishimura%2C+S">S. Nishimura</a>, <a href="/search/hep-ex?searchtype=author&query=Saito%2C+N">N. Saito</a>, <a href="/search/hep-ex?searchtype=author&query=Sasaki%2C+O">O. Sasaki</a>, <a href="/search/hep-ex?searchtype=author&query=Sato%2C+N">N. Sato</a>, <a href="/search/hep-ex?searchtype=author&query=Sato%2C+Y">Y. Sato</a>, <a href="/search/hep-ex?searchtype=author&query=Sendai%2C+H">H. Sendai</a>, <a href="/search/hep-ex?searchtype=author&query=Shimomura%2C+K">K. Shimomura</a>, <a href="/search/hep-ex?searchtype=author&query=Shirabe%2C+S">S. Shirabe</a>, <a href="/search/hep-ex?searchtype=author&query=Shoji%2C+M">M. Shoji</a>, <a href="/search/hep-ex?searchtype=author&query=Suda%2C+T">T. Suda</a>, <a href="/search/hep-ex?searchtype=author&query=Suehara%2C+T">T. Suehara</a>, <a href="/search/hep-ex?searchtype=author&query=Takatomi%2C+T">T. Takatomi</a>, <a href="/search/hep-ex?searchtype=author&query=Tanaka%2C+M">M. Tanaka</a>, <a href="/search/hep-ex?searchtype=author&query=Tojo%2C+J">J. Tojo</a>, <a href="/search/hep-ex?searchtype=author&query=Tsukada%2C+K">K. Tsukada</a>, <a href="/search/hep-ex?searchtype=author&query=Uchida%2C+T">T. Uchida</a> , et al. (4 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.13087v2-abstract-short" style="display: inline;"> A high-intensity pulsed muon beam is becoming available at the at the Japan Proton Accelerator Research Complex (J-PARC). Many experiments to study fundamental physics using this high-intensity muon beam are proposed. An experiment to measure the muon magnetic moment anomaly ($g-2$) and the muon electric dipole moment (EDM) is one of these experiments and it requires a tracking detector for positr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.13087v2-abstract-full').style.display = 'inline'; document.getElementById('1910.13087v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.13087v2-abstract-full" style="display: none;"> A high-intensity pulsed muon beam is becoming available at the at the Japan Proton Accelerator Research Complex (J-PARC). Many experiments to study fundamental physics using this high-intensity muon beam are proposed. An experiment to measure the muon magnetic moment anomaly ($g-2$) and the muon electric dipole moment (EDM) is one of these experiments and it requires a tracking detector for positrons from muon decay. Fine segmentation is required in a detector to tolerate the high rate of positrons. The time resolution is required to be much better than the muon anomalous spin precession period while a buffer depth of a front-end electronics needs to be much longer than the accelerated muon lifetime. Requirements of this detector also meet requirements of a measurement of the muonium hyperfine structure interval at the J-PARC and another experiment to measure the proton charge radius at Tohoku University. We have developed a single-sided silicon strip sensor with a 190 $渭$m pitch, a front-end electronics with a sampling rate of 200 MHz and a buffer memory depth of 8192, and a data acquisition system based on DAQ-Middleware for the J-PARC muon $g-2$/EDM experiment. We have fabricated detector modules consisting of this sensor and the front-end electronics. Performance of fabricated detector modules was evaluated at a laboratory and a beam test using the positron beam at Tohoku University. The detector is confirmed to satisfy all requirements of the experiments except for the time walk, which will be solved by the next version of a front-end electronics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.13087v2-abstract-full').style.display = 'none'; document.getElementById('1910.13087v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JINST 15 (2020) P04027 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.03047">arXiv:1901.03047</a> <span> [<a href="https://arxiv.org/pdf/1901.03047">pdf</a>, <a href="https://arxiv.org/format/1901.03047">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> </div> <p class="title is-5 mathjax"> A New Approach for Measuring the Muon Anomalous Magnetic Moment and Electric Dipole Moment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abe%2C+M">M. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Bae%2C+S">S. Bae</a>, <a href="/search/hep-ex?searchtype=author&query=Beer%2C+G">G. Beer</a>, <a href="/search/hep-ex?searchtype=author&query=Bunce%2C+G">G. Bunce</a>, <a href="/search/hep-ex?searchtype=author&query=Choi%2C+H">H. Choi</a>, <a href="/search/hep-ex?searchtype=author&query=Choi%2C+S">S. Choi</a>, <a href="/search/hep-ex?searchtype=author&query=Chung%2C+M">M. Chung</a>, <a href="/search/hep-ex?searchtype=author&query=da+Silva%2C+W">W. da Silva</a>, <a href="/search/hep-ex?searchtype=author&query=Eidelman%2C+S">S. Eidelman</a>, <a href="/search/hep-ex?searchtype=author&query=Finger%2C+M">M. Finger</a>, <a href="/search/hep-ex?searchtype=author&query=Fukao%2C+Y">Y. Fukao</a>, <a href="/search/hep-ex?searchtype=author&query=Fukuyama%2C+T">T. Fukuyama</a>, <a href="/search/hep-ex?searchtype=author&query=Haciomeroglu%2C+S">S. Haciomeroglu</a>, <a href="/search/hep-ex?searchtype=author&query=Hasegawa%2C+K">K. Hasegawa</a>, <a href="/search/hep-ex?searchtype=author&query=Hayasaka%2C+K">K. Hayasaka</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashizaki%2C+N">N. Hayashizaki</a>, <a href="/search/hep-ex?searchtype=author&query=Hisamatsu%2C+H">H. Hisamatsu</a>, <a href="/search/hep-ex?searchtype=author&query=Iijima%2C+T">T. Iijima</a>, <a href="/search/hep-ex?searchtype=author&query=Iinuma%2C+H">H. Iinuma</a>, <a href="/search/hep-ex?searchtype=author&query=Inami%2C+K">K. Inami</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeno%2C+M">M. Ikeno</a>, <a href="/search/hep-ex?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/hep-ex?searchtype=author&query=Itahashi%2C+T">T. Itahashi</a>, <a href="/search/hep-ex?searchtype=author&query=Iwasaki%2C+M">M. Iwasaki</a> , et al. (71 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.03047v2-abstract-short" style="display: inline;"> This paper introduces a new approach to measure the muon magnetic moment anomaly $a_渭 = (g-2)/2$, and the muon electric dipole moment (EDM) $d_渭$ at the J-PARC muon facility. The goal of our experiment is to measure $a_渭$ and $d_渭$ using an independent method with a factor of 10 lower muon momentum, and a factor of 20 smaller diameter storage-ring solenoid compared with previous and ongoing muon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.03047v2-abstract-full').style.display = 'inline'; document.getElementById('1901.03047v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.03047v2-abstract-full" style="display: none;"> This paper introduces a new approach to measure the muon magnetic moment anomaly $a_渭 = (g-2)/2$, and the muon electric dipole moment (EDM) $d_渭$ at the J-PARC muon facility. The goal of our experiment is to measure $a_渭$ and $d_渭$ using an independent method with a factor of 10 lower muon momentum, and a factor of 20 smaller diameter storage-ring solenoid compared with previous and ongoing muon $g-2$ experiments with unprecedented quality of the storage magnetic field. Additional significant differences from the present experimental method include a factor of 1,000 smaller transverse emittance of the muon beam (reaccelerated thermal muon beam), its efficient vertical injection into the solenoid, and tracking each decay positron from muon decay to obtain its momentum vector. The precision goal for $a_渭$ is statistical uncertainty of 450 part per billion (ppb), similar to the present experimental uncertainty, and a systematic uncertainty less than 70 ppb. The goal for EDM is a sensitivity of $1.5\times 10^{-21}~e\cdot\mbox{cm}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.03047v2-abstract-full').style.display = 'none'; document.getElementById('1901.03047v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 March, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 14 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.01366">arXiv:1802.01366</a> <span> [<a href="https://arxiv.org/pdf/1802.01366">pdf</a>, <a href="https://arxiv.org/format/1802.01366">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2018.05.071">10.1016/j.nima.2018.05.071 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First Measurements of Beam Backgrounds at SuperKEKB </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Lewis%2C+P+M">P. M. Lewis</a>, <a href="/search/hep-ex?searchtype=author&query=Jaegle%2C+I">I. Jaegle</a>, <a href="/search/hep-ex?searchtype=author&query=Nakayama%2C+H">H. Nakayama</a>, <a href="/search/hep-ex?searchtype=author&query=Aloisio%2C+A">A. Aloisio</a>, <a href="/search/hep-ex?searchtype=author&query=Ameli%2C+F">F. Ameli</a>, <a href="/search/hep-ex?searchtype=author&query=Barrett%2C+M">M. Barrett</a>, <a href="/search/hep-ex?searchtype=author&query=Beaulieu%2C+A">A. Beaulieu</a>, <a href="/search/hep-ex?searchtype=author&query=Bosisio%2C+L">L. Bosisio</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Browder%2C+T+E">T. E. Browder</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Cautero%2C+G">G. Cautero</a>, <a href="/search/hep-ex?searchtype=author&query=Cecchi%2C+C">C. Cecchi</a>, <a href="/search/hep-ex?searchtype=author&query=Chen%2C+Y+-">Y. -T. Chen</a>, <a href="/search/hep-ex?searchtype=author&query=Chu%2C+K+-">K. -N. Chu</a>, <a href="/search/hep-ex?searchtype=author&query=Cinabro%2C+D">D. Cinabro</a>, <a href="/search/hep-ex?searchtype=author&query=Cristaudo%2C+P">P. Cristaudo</a>, <a href="/search/hep-ex?searchtype=author&query=de+Jong%2C+S">S. de Jong</a>, <a href="/search/hep-ex?searchtype=author&query=de+Sangro%2C+R">R. de Sangro</a>, <a href="/search/hep-ex?searchtype=author&query=Finocchiaro%2C+G">G. Finocchiaro</a>, <a href="/search/hep-ex?searchtype=author&query=Flanagan%2C+J">J. Flanagan</a>, <a href="/search/hep-ex?searchtype=author&query=Funakoshi%2C+Y">Y. Funakoshi</a>, <a href="/search/hep-ex?searchtype=author&query=Gabriel%2C+M">M. Gabriel</a>, <a href="/search/hep-ex?searchtype=author&query=Giordano%2C+R">R. Giordano</a>, <a href="/search/hep-ex?searchtype=author&query=Giuressi%2C+D">D. Giuressi</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.01366v1-abstract-short" style="display: inline;"> The high design luminosity of the SuperKEKB electron-positron collider is expected to result in challenging levels of beam-induced backgrounds in the interaction region. Properly simulating and mitigating these backgrounds is critical to the success of the Belle~II experiment. We report on measurements performed with a suite of dedicated beam background detectors, collectively known as BEAST II, d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.01366v1-abstract-full').style.display = 'inline'; document.getElementById('1802.01366v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.01366v1-abstract-full" style="display: none;"> The high design luminosity of the SuperKEKB electron-positron collider is expected to result in challenging levels of beam-induced backgrounds in the interaction region. Properly simulating and mitigating these backgrounds is critical to the success of the Belle~II experiment. We report on measurements performed with a suite of dedicated beam background detectors, collectively known as BEAST II, during the so-called Phase 1 commissioning run of SuperKEKB in 2016, which involved operation of both the high energy ring (HER) of 7 GeV electrons as well as the low energy ring (LER) of 4 GeV positrons. We describe the BEAST II detector systems, the simulation of beam backgrounds, and the measurements performed. The measurements include standard ones of dose rates versus accelerator conditions, and more novel investigations, such as bunch-by-bunch measurements of injection backgrounds and measurements sensitive to the energy spectrum and angular distribution of fast neutrons. We observe beam-gas, Touschek, beam-dust, and injection backgrounds. We do not observe significant synchrotron radiation, as expected. Measured LER beam-gas backgrounds and Touschek backgrounds in both rings are slightly elevated, on average three times larger than the levels predicted by simulation. HER beam-gas backgrounds are on on average two orders of magnitude larger than predicted. Systematic uncertainties and channel-to-channel variations are large, so that these excesses constitute only 1-2 sigma level effects. Neutron background rates are higher than predicted and should be studied further. We will measure the remaining beam background processes, due to colliding beams, in the imminent commissioning Phase 2. These backgrounds are expected to be the most critical for Belle II, to the point of necessitating replacement of detector components during the Phase 3 (full-luminosity) operation of SuperKEB. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.01366v1-abstract-full').style.display = 'none'; document.getElementById('1802.01366v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">101 pages, 127 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1703.05603">arXiv:1703.05603</a> <span> [<a href="https://arxiv.org/pdf/1703.05603">pdf</a>, <a href="https://arxiv.org/ps/1703.05603">ps</a>, <a href="https://arxiv.org/format/1703.05603">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Radiation tolerance of FPCCD vertex detector for the ILC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Murai%2C+S">Shunsuke Murai</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+A">Akimasa Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Sanuki%2C+T">Tomoyuki Sanuki</a>, <a href="/search/hep-ex?searchtype=author&query=Miyamoto%2C+A">Akiya Miyamoto</a>, <a href="/search/hep-ex?searchtype=author&query=Sugimoto%2C+Y">Yasuhiro Sugimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Sato%2C+H">Hisao Sato</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">Hirokazu Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Yamamoto%2C+H">Hitoshi Yamamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1703.05603v1-abstract-short" style="display: inline;"> The Fine Pixel CCD (FPCCD) is one of the candidate sensor technologies for the ILC vertex detector. The vertex detector is located near the interaction point, thus high radiation tolerance is required. Charge transfer efficiency of CCD is degraded by radiation damage which makes traps in pixels. We measured charge transfer inefficiency (CTI) of a neutron irradiated FPCCD prototype. We observed a d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.05603v1-abstract-full').style.display = 'inline'; document.getElementById('1703.05603v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1703.05603v1-abstract-full" style="display: none;"> The Fine Pixel CCD (FPCCD) is one of the candidate sensor technologies for the ILC vertex detector. The vertex detector is located near the interaction point, thus high radiation tolerance is required. Charge transfer efficiency of CCD is degraded by radiation damage which makes traps in pixels. We measured charge transfer inefficiency (CTI) of a neutron irradiated FPCCD prototype. We observed a degradation of CTI compared with non-irradiated CCD. To improve the CTI of irradiated CCD, we performed the fat-zero charge injection to fill the traps. In this paper, we report a status of CTI improvement. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1703.05603v1-abstract-full').style.display = 'none'; document.getElementById('1703.05603v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 March, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Talk presented at the International Workshop on Future Linear Colliders (LCWS2016), Morioka, Japan, 5-9 December 2016. C16-12-05.4</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.07155">arXiv:1606.07155</a> <span> [<a href="https://arxiv.org/pdf/1606.07155">pdf</a>, <a href="https://arxiv.org/ps/1606.07155">ps</a>, <a href="https://arxiv.org/format/1606.07155">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/2041-8205/829/2/L34">10.3847/2041-8205/829/2/L34 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for electron antineutrinos associated with gravitational wave events GW150914 and GW151226 using KamLAND </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=KamLAND+Collaboration"> KamLAND Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashi%2C+A">A. Hayashi</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Karino%2C+Y">Y. Karino</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Obara%2C+S">S. Obara</a>, <a href="/search/hep-ex?searchtype=author&query=Oura%2C+T">T. Oura</a>, <a href="/search/hep-ex?searchtype=author&query=Ozaki%2C+H">H. Ozaki</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirahata%2C+Y">Y. Shirahata</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Takai%2C+T">T. Takai</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Teraoka%2C+Y">Y. Teraoka</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a> , et al. (23 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1606.07155v2-abstract-short" style="display: inline;"> We present a search for low energy antineutrino events coincident with the gravitational wave events GW150914 and GW151226, and the candidate event LVT151012 using KamLAND, a kiloton-scale antineutrino detector. We find no inverse beta-decay neutrino events within $\pm 500$ seconds of either gravitational wave signal. This non-detection is used to constrain the electron antineutrino fluence and th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.07155v2-abstract-full').style.display = 'inline'; document.getElementById('1606.07155v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.07155v2-abstract-full" style="display: none;"> We present a search for low energy antineutrino events coincident with the gravitational wave events GW150914 and GW151226, and the candidate event LVT151012 using KamLAND, a kiloton-scale antineutrino detector. We find no inverse beta-decay neutrino events within $\pm 500$ seconds of either gravitational wave signal. This non-detection is used to constrain the electron antineutrino fluence and the luminosity of the astrophysical sources. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.07155v2-abstract-full').style.display = 'none'; document.getElementById('1606.07155v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures, as published in ApJL. Updated to replace power law spectrum with Fermi Dirac spectrum</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Astrophys.J.829, L34, 2016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1603.02503">arXiv:1603.02503</a> <span> [<a href="https://arxiv.org/pdf/1603.02503">pdf</a>, <a href="https://arxiv.org/ps/1603.02503">ps</a>, <a href="https://arxiv.org/format/1603.02503">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1093/ptep/ptw005">10.1093/ptep/ptw005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Particle identification performance of the prototype Aerogel RICH counter for the Belle II experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Iwata%2C+S">S. Iwata</a>, <a href="/search/hep-ex?searchtype=author&query=Adachi%2C+I">I. Adachi</a>, <a href="/search/hep-ex?searchtype=author&query=Hara%2C+K">K. Hara</a>, <a href="/search/hep-ex?searchtype=author&query=Iijima%2C+T">T. Iijima</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Kakuno%2C+H">H. Kakuno</a>, <a href="/search/hep-ex?searchtype=author&query=Kawai%2C+H">H. Kawai</a>, <a href="/search/hep-ex?searchtype=author&query=Kawasaki%2C+T">T. Kawasaki</a>, <a href="/search/hep-ex?searchtype=author&query=Korpar%2C+S">S. Korpar</a>, <a href="/search/hep-ex?searchtype=author&query=Krizan%2C+P">P. Krizan</a>, <a href="/search/hep-ex?searchtype=author&query=Kumita%2C+T">T. Kumita</a>, <a href="/search/hep-ex?searchtype=author&query=Nishida%2C+S">S. Nishida</a>, <a href="/search/hep-ex?searchtype=author&query=Ogawa%2C+S">S. Ogawa</a>, <a href="/search/hep-ex?searchtype=author&query=Pestotnik%2C+R">R. Pestotnik</a>, <a href="/search/hep-ex?searchtype=author&query=%C5%A0antelj%2C+L">L. 艩antelj</a>, <a href="/search/hep-ex?searchtype=author&query=Seljak%2C+A">A. Seljak</a>, <a href="/search/hep-ex?searchtype=author&query=Tabata%2C+M">M. Tabata</a>, <a href="/search/hep-ex?searchtype=author&query=Tahirovi%C4%87%2C+E">E. Tahirovi膰</a>, <a href="/search/hep-ex?searchtype=author&query=Yusa%2C+Y">Y. Yusa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1603.02503v1-abstract-short" style="display: inline;"> We have developed a new type of particle identification device, called an Aerogel Ring Imaging Cherenkov (ARICH) counter, for the Belle II experiment. It uses silica aerogel tiles as Cherenkov radiators. For detection of Cherenkov photons, Hybrid Avalanche Photo-Detectors (HAPDs) are used. The designed HAPD has a high sensitivity to single photons under a strong magnetic field. We have confirmed t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.02503v1-abstract-full').style.display = 'inline'; document.getElementById('1603.02503v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1603.02503v1-abstract-full" style="display: none;"> We have developed a new type of particle identification device, called an Aerogel Ring Imaging Cherenkov (ARICH) counter, for the Belle II experiment. It uses silica aerogel tiles as Cherenkov radiators. For detection of Cherenkov photons, Hybrid Avalanche Photo-Detectors (HAPDs) are used. The designed HAPD has a high sensitivity to single photons under a strong magnetic field. We have confirmed that the HAPD provides high efficiency for single-photon detection even after exposure to neutron and gamma-ray radiation that exceeds the levels expected in the 10-year Belle II operation. In order to confirm the basic performance of the ARICH counter system, we carried out a beam test at the DESY using a prototype of the ARICH counter with six HAPD modules. The results are in agreement with our expectations and confirm the suitability of the ARICH counter for the Belle II experiment. Based on the in-beam performance of the device, we expect that the identification efficiency at 3.5 GeV/c is 97.4% and 4.9% for pions and kaons, respectively. This paper summarizes the development of the HAPD for the ARICH and the evaluation of the performance of the prototype ARICH counter built with the final design components. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.02503v1-abstract-full').style.display = 'none'; document.getElementById('1603.02503v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 22 figures, To be published in Prog. Theor. Exp. Phys</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Prog. Theor. Exp. Phys. (2016) 033H01 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1603.00009">arXiv:1603.00009</a> <span> [<a href="https://arxiv.org/pdf/1603.00009">pdf</a>, <a href="https://arxiv.org/ps/1603.00009">ps</a>, <a href="https://arxiv.org/format/1603.00009">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Recent status of FPCCD vertex detector R&D </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Murai%2C+S">S. Murai</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+A">A. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Sanuki%2C+T">T. Sanuki</a>, <a href="/search/hep-ex?searchtype=author&query=Miyamoto%2C+A">A. Miyamoto</a>, <a href="/search/hep-ex?searchtype=author&query=Sugimoto%2C+Y">Y. Sugimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Constantino%2C+C">C. Constantino</a>, <a href="/search/hep-ex?searchtype=author&query=Sato%2C+H">H. Sato</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Hitoshi%2C+Y">Y. Hitoshi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1603.00009v2-abstract-short" style="display: inline;"> The Fine Pixel CCD (FPCCD) is one of the candidate sensor technologies for the ILC vertex detector. It will be located near interaction point and require high radiation tolerance. It will thus be operated at -40 degree C to improve radiation tolerance. In this paper, we report on the status of neutron radiation tests, on a cooling system using two-phase CO2 with a gas compressor for circulation, a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.00009v2-abstract-full').style.display = 'inline'; document.getElementById('1603.00009v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1603.00009v2-abstract-full" style="display: none;"> The Fine Pixel CCD (FPCCD) is one of the candidate sensor technologies for the ILC vertex detector. It will be located near interaction point and require high radiation tolerance. It will thus be operated at -40 degree C to improve radiation tolerance. In this paper, we report on the status of neutron radiation tests, on a cooling system using two-phase CO2 with a gas compressor for circulation, and on the mechanical structure of the FPCCD ladders. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.00009v2-abstract-full').style.display = 'none'; document.getElementById('1603.00009v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Talk presented at the International Workshop on Future Linear Colliders (LCWS15), Whistler, Canada, 2-6 November 2015</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1509.03724">arXiv:1509.03724</a> <span> [<a href="https://arxiv.org/pdf/1509.03724">pdf</a>, <a href="https://arxiv.org/ps/1509.03724">ps</a>, <a href="https://arxiv.org/format/1509.03724">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nuclphysa.2015.11.011">10.1016/j.nuclphysa.2015.11.011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Asakura%2C+K">K. Asakura</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+T">T. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ishio%2C+S">S. Ishio</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Motoki%2C+D">D. Motoki</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Obara%2C+S">S. Obara</a>, <a href="/search/hep-ex?searchtype=author&query=Otani%2C+M">M. Otani</a>, <a href="/search/hep-ex?searchtype=author&query=Oura%2C+T">T. Oura</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirahata%2C+Y">Y. Shirahata</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Tachibana%2C+H">H. Tachibana</a> , et al. (21 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1509.03724v2-abstract-short" style="display: inline;"> A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 0+1, 2+1 and 2+2 transitions of 0谓\{beta}\{beta} decay were evaluated in an exposure of 89.5kg-yr of 136Xe, while the same transitions of 2谓\{beta}\{beta} decay were evaluated in an exposure of 61.8kg-yr. No excess over background was found for all… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.03724v2-abstract-full').style.display = 'inline'; document.getElementById('1509.03724v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1509.03724v2-abstract-full" style="display: none;"> A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 0+1, 2+1 and 2+2 transitions of 0谓\{beta}\{beta} decay were evaluated in an exposure of 89.5kg-yr of 136Xe, while the same transitions of 2谓\{beta}\{beta} decay were evaluated in an exposure of 61.8kg-yr. No excess over background was found for all decay modes. The lower half-life limits of the 2+1 state transitions of 0谓\{beta}\{beta} and 2谓\{beta}\{beta} decay were improved to T(0谓, 0+ \rightarrow 2+) > 2.6\times10^25 yr and T(2谓, 0+ \rightarrow 2+) > 4.6\times10^23 yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 0+1 state of 136Xe for 0谓\{beta}\{beta} and 2谓\{beta}\{beta} decay. They are T (0谓, 0+ \rightarrow 0+) > 2.4\times10^25 yr and T(2谓, 0+ \rightarrow 0+) > 8.3\times10^23 yr (90% C.L.). The transitions to the 2+2 states are also evaluated for the first time to be T(0谓, 0+ \rightarrow 2+) > 2.6\times10^25 yr and T(2谓, 0+ \rightarrow 2+) > 9.0\times10^23 yr (90% C.L.). These results are compared to recent theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.03724v2-abstract-full').style.display = 'none'; document.getElementById('1509.03724v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 4 figures. Published in Nuclear Physics A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1506.01175">arXiv:1506.01175</a> <span> [<a href="https://arxiv.org/pdf/1506.01175">pdf</a>, <a href="https://arxiv.org/ps/1506.01175">ps</a>, <a href="https://arxiv.org/format/1506.01175">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3847/0004-637X/818/1/91">10.3847/0004-637X/818/1/91 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> KamLAND Sensitivity to Neutrinos from Pre-Supernova Stars </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Asakura%2C+K">K. Asakura</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+T">T. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ishio%2C+S">S. Ishio</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Motoki%2C+D">D. Motoki</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Obara%2C+S">S. Obara</a>, <a href="/search/hep-ex?searchtype=author&query=Oura%2C+T">T. Oura</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirahata%2C+Y">Y. Shirahata</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Tachibana%2C+H">H. Tachibana</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a> , et al. (22 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1506.01175v4-abstract-short" style="display: inline;"> In the late stages of nuclear burning for massive stars ($M>8~M_{\sun}$), the production of neutrino-antineutrino pairs through various processes becomes the dominant stellar cooling mechanism. As the star evolves, the energy of these neutrinos increases and in the days preceding the supernova a significant fraction of emitted electron anti-neutrinos exceeds the energy threshold for inverse beta d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.01175v4-abstract-full').style.display = 'inline'; document.getElementById('1506.01175v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1506.01175v4-abstract-full" style="display: none;"> In the late stages of nuclear burning for massive stars ($M>8~M_{\sun}$), the production of neutrino-antineutrino pairs through various processes becomes the dominant stellar cooling mechanism. As the star evolves, the energy of these neutrinos increases and in the days preceding the supernova a significant fraction of emitted electron anti-neutrinos exceeds the energy threshold for inverse beta decay on free hydrogen. This is the golden channel for liquid scintillator detectors because the coincidence signature allows for significant reductions in background signals. We find that the kiloton-scale liquid scintillator detector KamLAND can detect these pre-supernova neutrinos from a star with a mass of $25~M_{\sun}$ at a distance less than 690~pc with 3$蟽$ significance before the supernova. This limit is dependent on the neutrino mass ordering and background levels. KamLAND takes data continuously and can provide a supernova alert to the community. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1506.01175v4-abstract-full').style.display = 'none'; document.getElementById('1506.01175v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 6 figures, 1 table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1503.02137">arXiv:1503.02137</a> <span> [<a href="https://arxiv.org/pdf/1503.02137">pdf</a>, <a href="https://arxiv.org/ps/1503.02137">ps</a>, <a href="https://arxiv.org/format/1503.02137">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0004-637X/806/1/87">10.1088/0004-637X/806/1/87 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of electron anti-neutrinos associated with gamma-ray bursts using KamLAND </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Asakura%2C+K">K. Asakura</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+T">T. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ishio%2C+S">S. Ishio</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Motoki%2C+D">D. Motoki</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Obara%2C+S">S. Obara</a>, <a href="/search/hep-ex?searchtype=author&query=Oki%2C+Y">Y. Oki</a>, <a href="/search/hep-ex?searchtype=author&query=Oura%2C+T">T. Oura</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirahata%2C+Y">Y. Shirahata</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Tachibana%2C+H">H. Tachibana</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a> , et al. (23 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1503.02137v2-abstract-short" style="display: inline;"> We search for electron anti-neutrinos ($\overline谓_e$) from long and short-duration gamma-ray bursts~(GRBs) using data taken by the KamLAND detector from August 2002 to June 2013. No statistically significant excess over the background level is found. We place the tightest upper limits on $\overline谓_e$ fluence from GRBs below 7 MeV and place first constraints on the relation between… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.02137v2-abstract-full').style.display = 'inline'; document.getElementById('1503.02137v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1503.02137v2-abstract-full" style="display: none;"> We search for electron anti-neutrinos ($\overline谓_e$) from long and short-duration gamma-ray bursts~(GRBs) using data taken by the KamLAND detector from August 2002 to June 2013. No statistically significant excess over the background level is found. We place the tightest upper limits on $\overline谓_e$ fluence from GRBs below 7 MeV and place first constraints on the relation between $\overline谓_e$ luminosity and effective temperature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.02137v2-abstract-full').style.display = 'none'; document.getElementById('1503.02137v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages and 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> ApJ 806 87 2015 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1407.0413">arXiv:1407.0413</a> <span> [<a href="https://arxiv.org/pdf/1407.0413">pdf</a>, <a href="https://arxiv.org/format/1407.0413">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2014.09.068">10.1016/j.nima.2014.09.068 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Banks%2C+T+I">T. I. Banks</a>, <a href="/search/hep-ex?searchtype=author&query=Freedman%2C+S+J">S. J. Freedman</a>, <a href="/search/hep-ex?searchtype=author&query=Wallig%2C+J">J. Wallig</a>, <a href="/search/hep-ex?searchtype=author&query=Ybarrolaza%2C+N">N. Ybarrolaza</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Takemoto%2C+Y">Y. Takemoto</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a>, <a href="/search/hep-ex?searchtype=author&query=Xu%2C+B+D">B. D. Xu</a>, <a href="/search/hep-ex?searchtype=author&query=Yoshida%2C+H">H. Yoshida</a>, <a href="/search/hep-ex?searchtype=author&query=Yoshida%2C+S">S. Yoshida</a>, <a href="/search/hep-ex?searchtype=author&query=Kozlov%2C+A">A. Kozlov</a>, <a href="/search/hep-ex?searchtype=author&query=Grant%2C+C">C. Grant</a>, <a href="/search/hep-ex?searchtype=author&query=Keefer%2C+G">G. Keefer</a> , et al. (32 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1407.0413v2-abstract-short" style="display: inline;"> We describe a compact, ultra-clean device used to deploy radioactive sources along the vertical axis of the KamLAND liquid-scintillator neutrino detector for purposes of calibration. The device worked by paying out and reeling in precise lengths of a hanging, small-gauge wire rope (cable); an assortment of interchangeable radioactive sources could be attached to a weight at the end of the cable. A… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.0413v2-abstract-full').style.display = 'inline'; document.getElementById('1407.0413v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1407.0413v2-abstract-full" style="display: none;"> We describe a compact, ultra-clean device used to deploy radioactive sources along the vertical axis of the KamLAND liquid-scintillator neutrino detector for purposes of calibration. The device worked by paying out and reeling in precise lengths of a hanging, small-gauge wire rope (cable); an assortment of interchangeable radioactive sources could be attached to a weight at the end of the cable. All components exposed to the radiopure liquid scintillator were made of chemically compatible UHV-cleaned materials, primarily stainless steel, in order to avoid contaminating or degrading the scintillator. To prevent radon intrusion, the apparatus was enclosed in a hermetically sealed housing inside a glove box, and both volumes were regularly flushed with purified nitrogen gas. An infrared camera attached to the side of the housing permitted real-time visual monitoring of the cable's motion, and the system was controlled via a graphical user interface. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.0413v2-abstract-full').style.display = 'none'; document.getElementById('1407.0413v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Revised author affiliations, corrected typos, made minor improvements to text, and revised references</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instruments and Methods in Physics Research Section A, Volume 769, 1 January 2015, pages 88-96 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1406.6311">arXiv:1406.6311</a> <span> [<a href="https://arxiv.org/pdf/1406.6311">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-014-3026-9">10.1140/epjc/s10052-014-3026-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Physics of the B Factories </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Bevan%2C+A+J">A. J. Bevan</a>, <a href="/search/hep-ex?searchtype=author&query=Golob%2C+B">B. Golob</a>, <a href="/search/hep-ex?searchtype=author&query=Mannel%2C+T">Th. Mannel</a>, <a href="/search/hep-ex?searchtype=author&query=Prell%2C+S">S. Prell</a>, <a href="/search/hep-ex?searchtype=author&query=Yabsley%2C+B+D">B. D. Yabsley</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+K">K. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Aihara%2C+H">H. Aihara</a>, <a href="/search/hep-ex?searchtype=author&query=Anulli%2C+F">F. Anulli</a>, <a href="/search/hep-ex?searchtype=author&query=Arnaud%2C+N">N. Arnaud</a>, <a href="/search/hep-ex?searchtype=author&query=Aushev%2C+T">T. Aushev</a>, <a href="/search/hep-ex?searchtype=author&query=Beneke%2C+M">M. Beneke</a>, <a href="/search/hep-ex?searchtype=author&query=Beringer%2C+J">J. Beringer</a>, <a href="/search/hep-ex?searchtype=author&query=Bianchi%2C+F">F. Bianchi</a>, <a href="/search/hep-ex?searchtype=author&query=Bigi%2C+I+I">I. I. Bigi</a>, <a href="/search/hep-ex?searchtype=author&query=Bona%2C+M">M. Bona</a>, <a href="/search/hep-ex?searchtype=author&query=Brambilla%2C+N">N. Brambilla</a>, <a href="/search/hep-ex?searchtype=author&query=rodzicka%2C+J+B">J. B rodzicka</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+P">P. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Charles%2C+M+J">M. J. Charles</a>, <a href="/search/hep-ex?searchtype=author&query=Cheng%2C+C+H">C. H. Cheng</a>, <a href="/search/hep-ex?searchtype=author&query=Cheng%2C+H+-">H. -Y. Cheng</a>, <a href="/search/hep-ex?searchtype=author&query=Chistov%2C+R">R. Chistov</a>, <a href="/search/hep-ex?searchtype=author&query=Colangelo%2C+P">P. Colangelo</a>, <a href="/search/hep-ex?searchtype=author&query=Coleman%2C+J+P">J. P. Coleman</a>, <a href="/search/hep-ex?searchtype=author&query=Drutskoy%2C+A">A. Drutskoy</a> , et al. (2009 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1406.6311v4-abstract-short" style="display: inline;"> This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C. Please note that version 3 on the archive is the auxiliary… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6311v4-abstract-full').style.display = 'inline'; document.getElementById('1406.6311v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.6311v4-abstract-full" style="display: none;"> This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C. Please note that version 3 on the archive is the auxiliary version of the Physics of the B Factories book. This uses the notation alpha, beta, gamma for the angles of the Unitarity Triangle. The nominal version uses the notation phi_1, phi_2 and phi_3. Please cite this work as Eur. Phys. J. C74 (2014) 3026. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6311v4-abstract-full').style.display = 'none'; document.getElementById('1406.6311v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">928 pages, version 3 (arXiv:1406.6311v3) corresponds to the alpha, beta, gamma version of the book, the other versions use the phi1, phi2, phi3 notation</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> SLAC-PUB-15968, KEK Preprint 2014-3 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C74 (2014) 3026 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.6190">arXiv:1405.6190</a> <span> [<a href="https://arxiv.org/pdf/1405.6190">pdf</a>, <a href="https://arxiv.org/ps/1405.6190">ps</a>, <a href="https://arxiv.org/format/1405.6190">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Solar and Stellar Astrophysics">astro-ph.SR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.92.055808">10.1103/PhysRevC.92.055808 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> 7Be Solar Neutrino Measurement with KamLAND </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hanakago%2C+H">H. Hanakago</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+H">H. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+R">R. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Motoki%2C+D">D. Motoki</a>, <a href="/search/hep-ex?searchtype=author&query=Nakajima%2C+K">K. Nakajima</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Obata%2C+A">A. Obata</a>, <a href="/search/hep-ex?searchtype=author&query=Oki%2C+A">A. Oki</a>, <a href="/search/hep-ex?searchtype=author&query=Oki%2C+Y">Y. Oki</a>, <a href="/search/hep-ex?searchtype=author&query=Otani%2C+M">M. Otani</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a> , et al. (46 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1405.6190v2-abstract-short" style="display: inline;"> We report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7Be solar neutrinos based on a 165.4 kton-day exposure of KamLAND. The observed rate is 582 +/- 90 (kton-day)^-1, which corresponds to a 862 keV 7Be solar neutrino flux of (3.26 +/- 0.50) x 10^9 cm^-2s^-1, assuming a pure electron flavor flux. Comparing this flux with the standard solar model prediction and further… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.6190v2-abstract-full').style.display = 'inline'; document.getElementById('1405.6190v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.6190v2-abstract-full" style="display: none;"> We report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7Be solar neutrinos based on a 165.4 kton-day exposure of KamLAND. The observed rate is 582 +/- 90 (kton-day)^-1, which corresponds to a 862 keV 7Be solar neutrino flux of (3.26 +/- 0.50) x 10^9 cm^-2s^-1, assuming a pure electron flavor flux. Comparing this flux with the standard solar model prediction and further assuming three flavor mixing, a nu_e survival probability of 0.66 +/- 0.14 is determined from the KamLAND data. Utilizing a global three flavor oscillation analysis, we obtain a total 7Be solar neutrino flux of (5.82 +/- 0.98) x 10^9 cm^-2s^-1, which is consistent with the standard solar model predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.6190v2-abstract-full').style.display = 'none'; document.getElementById('1405.6190v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 6 figures, submitted to Phys. Rev. C</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.0977">arXiv:1312.0977</a> <span> [<a href="https://arxiv.org/pdf/1312.0977">pdf</a>, <a href="https://arxiv.org/format/1312.0977">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Laboratory Studies on the Removal of Radon-Born Lead from KamLAND's Organic Liquid Scintillator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Keefer%2C+G">G. Keefer</a>, <a href="/search/hep-ex?searchtype=author&query=Grant%2C+C">C. Grant</a>, <a href="/search/hep-ex?searchtype=author&query=Piepke%2C+A">A. Piepke</a>, <a href="/search/hep-ex?searchtype=author&query=Ebihara%2C+T">T. Ebihara</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Kibe%2C+Y">Y. Kibe</a>, <a href="/search/hep-ex?searchtype=author&query=Koseki%2C+Y">Y. Koseki</a>, <a href="/search/hep-ex?searchtype=author&query=Ogawa%2C+M">M. Ogawa</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Takeuchi%2C+S">S. Takeuchi</a>, <a href="/search/hep-ex?searchtype=author&query=Mauger%2C+C">C. Mauger</a>, <a href="/search/hep-ex?searchtype=author&query=Zhang%2C+C">C. Zhang</a>, <a href="/search/hep-ex?searchtype=author&query=Schweitzer%2C+G">G. Schweitzer</a>, <a href="/search/hep-ex?searchtype=author&query=Berger%2C+B+E">B. E. Berger</a>, <a href="/search/hep-ex?searchtype=author&query=Dazeley%2C+S">S. Dazeley</a>, <a href="/search/hep-ex?searchtype=author&query=Decowski%2C+M+P">M. P. Decowski</a>, <a href="/search/hep-ex?searchtype=author&query=Detwiler%2C+J+A">J. A. Detwiler</a>, <a href="/search/hep-ex?searchtype=author&query=Djurcic%2C+Z">Z. Djurcic</a>, <a href="/search/hep-ex?searchtype=author&query=Dwyer%2C+D+A">D. A. Dwyer</a>, <a href="/search/hep-ex?searchtype=author&query=Efremenko%2C+Y">Y. Efremenko</a>, <a href="/search/hep-ex?searchtype=author&query=Enomoto%2C+S">S. Enomoto</a>, <a href="/search/hep-ex?searchtype=author&query=Freedman%2C+S+J">S. J. Freedman</a>, <a href="/search/hep-ex?searchtype=author&query=Fujikawa%2C+B+K">B. K. Fujikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Furuno%2C+K">K. Furuno</a> , et al. (43 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1312.0977v1-abstract-short" style="display: inline;"> The removal of radioactivity from liquid scintillator has been studied in preparation of a low background phase of KamLAND. This paper describes the methods and techniques developed to measure and efficiently extract radon decay products from liquid scintillator. We report the radio-isotope reduction factors obtained when applying various extraction methods. During this study, distillation was ide… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.0977v1-abstract-full').style.display = 'inline'; document.getElementById('1312.0977v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.0977v1-abstract-full" style="display: none;"> The removal of radioactivity from liquid scintillator has been studied in preparation of a low background phase of KamLAND. This paper describes the methods and techniques developed to measure and efficiently extract radon decay products from liquid scintillator. We report the radio-isotope reduction factors obtained when applying various extraction methods. During this study, distillation was identified as the most efficient method for removing radon daughters from liquid scintillator. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.0977v1-abstract-full').style.display = 'none'; document.getElementById('1312.0977v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 December, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 85-05 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.0896">arXiv:1312.0896</a> <span> [<a href="https://arxiv.org/pdf/1312.0896">pdf</a>, <a href="https://arxiv.org/format/1312.0896">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> CeLAND: search for a 4th light neutrino state with a 3 PBq 144Ce-144Pr electron antineutrino generator in KamLAND </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+H">H. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+R">R. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Motoki%2C+D">D. Motoki</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Oki%2C+Y">Y. Oki</a>, <a href="/search/hep-ex?searchtype=author&query=Otani%2C+M">M. Otani</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suekane%2C+F">F. Suekane</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Takemoto%2C+Y">Y. Takemoto</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a>, <a href="/search/hep-ex?searchtype=author&query=Xu%2C+B+D">B. D. Xu</a>, <a href="/search/hep-ex?searchtype=author&query=Yamada%2C+S">S. Yamada</a> , et al. (41 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1312.0896v2-abstract-short" style="display: inline;"> The reactor neutrino and gallium anomalies can be tested with a 3-4 PBq (75-100 kCi scale) 144Ce-144Pr antineutrino beta-source deployed at the center or next to a large low-background liquid scintillator detector. The antineutrino generator will be produced by the Russian reprocessing plant PA Mayak as early as 2014, transported to Japan, and deployed in the Kamioka Liquid Scintillator Anti-Neutr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.0896v2-abstract-full').style.display = 'inline'; document.getElementById('1312.0896v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.0896v2-abstract-full" style="display: none;"> The reactor neutrino and gallium anomalies can be tested with a 3-4 PBq (75-100 kCi scale) 144Ce-144Pr antineutrino beta-source deployed at the center or next to a large low-background liquid scintillator detector. The antineutrino generator will be produced by the Russian reprocessing plant PA Mayak as early as 2014, transported to Japan, and deployed in the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND) as early as 2015. KamLAND's 13 m diameter target volume provides a suitable environment to measure the energy and position dependence of the detected neutrino flux. A characteristic oscillation pattern would be visible for a baseline of about 10 m or less, providing a very clean signal of neutrino disappearance into a yet-unknown, sterile neutrino state. This will provide a comprehensive test of the electron dissaperance neutrino anomalies and could lead to the discovery of a 4th neutrino state for Delta_m^2 > 0.1 eV^2 and sin^2(2theta) > 0.05. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.0896v2-abstract-full').style.display = 'none'; document.getElementById('1312.0896v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 December, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">67 pages, 50 figures. Th. Lasserre thanks the European Research Council for support under the Starting Grant StG-307184</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1309.6805">arXiv:1309.6805</a> <span> [<a href="https://arxiv.org/pdf/1309.6805">pdf</a>, <a href="https://arxiv.org/format/1309.6805">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> White paper: CeLAND - Investigation of the reactor antineutrino anomaly with an intense 144Ce-144Pr antineutrino source in KamLAND </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+H">H. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+R">R. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Motoki%2C+D">D. Motoki</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Oki%2C+Y">Y. Oki</a>, <a href="/search/hep-ex?searchtype=author&query=Otani%2C+M">M. Otani</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suekane%2C+F">F. Suekane</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Takemoto%2C+Y">Y. Takemoto</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a>, <a href="/search/hep-ex?searchtype=author&query=Xu%2C+B+D">B. D. Xu</a>, <a href="/search/hep-ex?searchtype=author&query=Yamada%2C+S">S. Yamada</a> , et al. (35 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1309.6805v2-abstract-short" style="display: inline;"> We propose to test for short baseline neutrino oscillations, implied by the recent reevaluation of the reactor antineutrino flux and by anomalous results from the gallium solar neutrino detectors. The test will consist of producing a 75 kCi 144Ce - 144Pr antineutrino source to be deployed in the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND). KamLAND's 13m diameter target volume prov… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.6805v2-abstract-full').style.display = 'inline'; document.getElementById('1309.6805v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1309.6805v2-abstract-full" style="display: none;"> We propose to test for short baseline neutrino oscillations, implied by the recent reevaluation of the reactor antineutrino flux and by anomalous results from the gallium solar neutrino detectors. The test will consist of producing a 75 kCi 144Ce - 144Pr antineutrino source to be deployed in the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND). KamLAND's 13m diameter target volume provides a suitable environment to measure energy and position dependence of the detected neutrino flux. A characteristic oscillation pattern would be visible for a baseline of about 10 m or less, providing a very clean signal of neutrino disappearance into a yet-unknown, "sterile" state. Such a measurement will be free of any reactor-related uncertainties. After 1.5 years of data taking the Reactor Antineutrino Anomaly parameter space will be tested at > 95% C.L. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.6805v2-abstract-full').style.display = 'none'; document.getElementById('1309.6805v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 October, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 September, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">White paper prepared for Snowmass-2013; slightly different author list</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1205.6372">arXiv:1205.6372</a> <span> [<a href="https://arxiv.org/pdf/1205.6372">pdf</a>, <a href="https://arxiv.org/ps/1205.6372">ps</a>, <a href="https://arxiv.org/format/1205.6372">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.86.021601">10.1103/PhysRevC.86.021601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hanakago%2C+H">H. Hanakago</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Kato%2C+R">R. Kato</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Nakada%2C+T">T. Nakada</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Obata%2C+A">A. Obata</a>, <a href="/search/hep-ex?searchtype=author&query=Oki%2C+A">A. Oki</a>, <a href="/search/hep-ex?searchtype=author&query=Ono%2C+Y">Y. Ono</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Takemoto%2C+Y">Y. Takemoto</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a>, <a href="/search/hep-ex?searchtype=author&query=Xu%2C+B+D">B. D. Xu</a>, <a href="/search/hep-ex?searchtype=author&query=Yamada%2C+S">S. Yamada</a> , et al. (16 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1205.6372v2-abstract-short" style="display: inline;"> We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (spectral index n = 1) Majoron-emitting decay half-life of Xe-136 is obtained as T_{1/2}^{0谓蠂^{0}} > 2.6 x 10^{24} yr at 90% C.L., a factor of five more stringent than previous limits. The corresponding upper limit on the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.6372v2-abstract-full').style.display = 'inline'; document.getElementById('1205.6372v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1205.6372v2-abstract-full" style="display: none;"> We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (spectral index n = 1) Majoron-emitting decay half-life of Xe-136 is obtained as T_{1/2}^{0谓蠂^{0}} > 2.6 x 10^{24} yr at 90% C.L., a factor of five more stringent than previous limits. The corresponding upper limit on the effective Majoron-neutrino coupling, using a range of available nuclear matrix calculations, is <g_{ee}> < (0.8 - 1.6) x 10^{-5}. This excludes a previously unconstrained region of parameter space and strongly limits the possible contribution of ordinary Majoron emission modes to 0谓尾尾decay for neutrino masses in the inverted hierarchy scheme. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.6372v2-abstract-full').style.display = 'none'; document.getElementById('1205.6372v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 August, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 3 figures (1 figure added). Published version in PRC rapid communication</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C86:021601,2012 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.3017">arXiv:1202.3017</a> <span> [<a href="https://arxiv.org/pdf/1202.3017">pdf</a>, <a href="https://arxiv.org/ps/1202.3017">ps</a>, <a href="https://arxiv.org/format/1202.3017">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Developement of readout ASIC for FPCCD vertex detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Kato%2C+E">Eriko Kato</a>, <a href="/search/hep-ex?searchtype=author&query=Sato%2C+H">Hisao Sato</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">Hirokazu Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Sugimoto%2C+Y">Yasuhiro Sugimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Itagaki%2C+K">Kennosuke Itagaki</a>, <a href="/search/hep-ex?searchtype=author&query=Saito%2C+T">Tomoyuki Saito</a>, <a href="/search/hep-ex?searchtype=author&query=Miyamoto%2C+A">Akiya Miyamoto</a>, <a href="/search/hep-ex?searchtype=author&query=Takubo%2C+Y">Yosuke Takubo</a>, <a href="/search/hep-ex?searchtype=author&query=Yamamoto%2C+H">Hitoshi Yamamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1202.3017v1-abstract-short" style="display: inline;"> One of candidates for the International Linear Collider(ILC)'s vertex detector is the Fine Pixel CCD (FPCCD) with a pixel size of 5 \times 5 (\mum^2). Sensor and readout systems are currently being studied and prototypes have been developed. In this paper we will report on the performance of latest developed readout ASIC prototype as well as the outline of the design strategy for the next ASIC pro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.3017v1-abstract-full').style.display = 'inline'; document.getElementById('1202.3017v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.3017v1-abstract-full" style="display: none;"> One of candidates for the International Linear Collider(ILC)'s vertex detector is the Fine Pixel CCD (FPCCD) with a pixel size of 5 \times 5 (\mum^2). Sensor and readout systems are currently being studied and prototypes have been developed. In this paper we will report on the performance of latest developed readout ASIC prototype as well as the outline of the design strategy for the next ASIC prototype. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.3017v1-abstract-full').style.display = 'none'; document.getElementById('1202.3017v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures, 2 tables, presented at the Linear Collider Workshop (LCWS '11), Granada, Spain, 26-30 Sept. 2011</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1106.0861">arXiv:1106.0861</a> <span> [<a href="https://arxiv.org/pdf/1106.0861">pdf</a>, <a href="https://arxiv.org/ps/1106.0861">ps</a>, <a href="https://arxiv.org/format/1106.0861">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Solar and Stellar Astrophysics">astro-ph.SR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.84.035804">10.1103/PhysRevC.84.035804 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the 8B Solar Neutrino Flux with the KamLAND Liquid Scintillator Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=KamLAND+Collaboration"> KamLAND Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Furuno%2C+K">K. Furuno</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Kibe%2C+Y">Y. Kibe</a>, <a href="/search/hep-ex?searchtype=author&query=Kimura%2C+W">W. Kimura</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Minekawa%2C+Y">Y. Minekawa</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Morikawa%2C+T">T. Morikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Nagai%2C+N">N. Nagai</a>, <a href="/search/hep-ex?searchtype=author&query=Nakajima%2C+K">K. Nakajima</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+M">M. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Narita%2C+K">K. Narita</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+Y">Y. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suekane%2C+F">F. Suekane</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a> , et al. (55 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1106.0861v3-abstract-short" style="display: inline;"> We report a measurement of the neutrino-electron elastic scattering rate from 8B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5 MeV analysis threshold is 1.49+/-0.14(stat)+/-0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a 8B neutrino spectrum, this corresponds to a spectrum integrated… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.0861v3-abstract-full').style.display = 'inline'; document.getElementById('1106.0861v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1106.0861v3-abstract-full" style="display: none;"> We report a measurement of the neutrino-electron elastic scattering rate from 8B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5 MeV analysis threshold is 1.49+/-0.14(stat)+/-0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a 8B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77+/-0.26(stat)+/-0.32(syst) x 10^6 cm^-2s^-1. The analysis threshold is driven by 208Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic 11Be. The measured rate is consistent with existing measurements and with Standard Solar Model predictions which include matter enhanced neutrino oscillation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.0861v3-abstract-full').style.display = 'none'; document.getElementById('1106.0861v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 August, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1006.4226">arXiv:1006.4226</a> <span> [<a href="https://arxiv.org/pdf/1006.4226">pdf</a>, <a href="https://arxiv.org/ps/1006.4226">ps</a>, <a href="https://arxiv.org/format/1006.4226">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2010.12.149">10.1016/j.nima.2010.12.149 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Irradiation test on FD-SOI Readout ASIC of Pair-monitor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Sato%2C+Y">Yutaro Sato</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">Hirokazu Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Miyamoto%2C+A">Akiya Miyamoto</a>, <a href="/search/hep-ex?searchtype=author&query=Takubo%2C+Y">Yosuke Takubo</a>, <a href="/search/hep-ex?searchtype=author&query=Tauchi%2C+T">Toshiaki Tauchi</a>, <a href="/search/hep-ex?searchtype=author&query=Yamamoto%2C+H">Hitoshi Yamamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1006.4226v1-abstract-short" style="display: inline;"> We fabricated a readout ASIC with the fully depleted silicon-on-insulator (FD-SOI) technology for the pair-monitor. The pair-monitor is a silicon pixel device that measures the beam profile of the international linear collider. It utilizes the directional distribution of a large number of electron-positron pairs created by collision of bunches, and is required to tolerate radiation dose of about a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1006.4226v1-abstract-full').style.display = 'inline'; document.getElementById('1006.4226v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1006.4226v1-abstract-full" style="display: none;"> We fabricated a readout ASIC with the fully depleted silicon-on-insulator (FD-SOI) technology for the pair-monitor. The pair-monitor is a silicon pixel device that measures the beam profile of the international linear collider. It utilizes the directional distribution of a large number of electron-positron pairs created by collision of bunches, and is required to tolerate radiation dose of about a few Mrad/year. The irradiation might cause the buried oxide layer of SOI to accumulate charges which interfere with intended functions. We thus performed extensive irradiation tests on the prototype ASIC, and the results are described in this paper. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1006.4226v1-abstract-full').style.display = 'none'; document.getElementById('1006.4226v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 June, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 3 figures, LCWS10</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0108044">arXiv:hep-ex/0108044</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0108044">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0108044">ps</a>, <a href="https://arxiv.org/format/hep-ex/0108044">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0168-9002(01)02113-1">10.1016/S0168-9002(01)02113-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electron Identification in Belle </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Hanagaki%2C+K">K. Hanagaki</a>, <a href="/search/hep-ex?searchtype=author&query=Kakuno%2C+H">H. Kakuno</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Iijima%2C+T">T. Iijima</a>, <a href="/search/hep-ex?searchtype=author&query=Tsukamoto%2C+T">T. Tsukamoto</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0108044v1-abstract-short" style="display: inline;"> We report on electron identification methods and their performance in the Belle experiment at the KEK-B asymmetric B-Factory $e^{+} e^{-}$ storage ring. Electrons are selected using a likelihood approach that takes information from the electromagnetic calorimeter, the central drift chamber, and the silica aerogel Cherenkov counters as input. We achieve an electron identification efficiency of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0108044v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0108044v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0108044v1-abstract-full" style="display: none;"> We report on electron identification methods and their performance in the Belle experiment at the KEK-B asymmetric B-Factory $e^{+} e^{-}$ storage ring. Electrons are selected using a likelihood approach that takes information from the electromagnetic calorimeter, the central drift chamber, and the silica aerogel Cherenkov counters as input. We achieve an electron identification efficiency of $(92.4 \pm 0.4)%$ with a $蟺^{\pm}$ fake rate of $(0.25 \pm 0.02)%$ for the momentum range between 1.0 GeV/$c$ and 3.0 GeV/$c$ in laboratory frame. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0108044v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0108044v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 August, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2001. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.A485:490-503,2002 </p> </li> </ol> 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