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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.15401">arXiv:2406.15401</a> <span> [<a href="https://arxiv.org/pdf/2406.15401">pdf</a>, <a href="https://arxiv.org/ps/2406.15401">ps</a>, <a href="https://arxiv.org/format/2406.15401">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="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Endo%2C+S">S. Endo</a>, <a href="/search/physics?searchtype=author&query=Abe%2C+R">R. Abe</a>, <a href="/search/physics?searchtype=author&query=Fujioka%2C+H">H. Fujioka</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">T. Ino</a>, <a href="/search/physics?searchtype=author&query=Iwamoto%2C+O">O. Iwamoto</a>, <a href="/search/physics?searchtype=author&query=Iwamoto%2C+N">N. Iwamoto</a>, <a href="/search/physics?searchtype=author&query=Kawamura%2C+S">S. Kawamura</a>, <a href="/search/physics?searchtype=author&query=Kimura%2C+A">A. Kimura</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Kobayashi%2C+R">R. Kobayashi</a>, <a href="/search/physics?searchtype=author&query=Nakamura%2C+S">S. Nakamura</a>, <a href="/search/physics?searchtype=author&query=Okudaira%2C+T+O+T">T. Oku T. Okudaira</a>, <a href="/search/physics?searchtype=author&query=Okuizumi%2C+M">M. Okuizumi</a>, <a href="/search/physics?searchtype=author&query=Omer%2C+M">M. Omer</a>, <a href="/search/physics?searchtype=author&query=Rovira%2C+G">G. Rovira</a>, <a href="/search/physics?searchtype=author&query=Shima%2C+T">T. Shima</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Shizuma%2C+T">T. Shizuma</a>, <a href="/search/physics?searchtype=author&query=Taira%2C+Y">Y. Taira</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+S">S. Takada</a>, <a href="/search/physics?searchtype=author&query=Takahashi%2C+S">S. Takahashi</a>, <a href="/search/physics?searchtype=author&query=Yoshikawa%2C+H">H. Yoshikawa</a>, <a href="/search/physics?searchtype=author&query=Yoshioka%2C+T">T. Yoshioka</a>, <a href="/search/physics?searchtype=author&query=Zen%2C+H">H. Zen</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="2406.15401v1-abstract-short" style="display: inline;"> Measurements of circular polarization of $纬$-ray emitted from neutron capture reactions provide valuable information for nuclear physics studies. The spin and parity of excited states can be determined by measuring the circular polarization from polarized neutron capture reactions. Furthermore, the $纬$-ray circular polarization in a neutron capture resonance is crucial for studying the enhancement… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.15401v1-abstract-full').style.display = 'inline'; document.getElementById('2406.15401v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.15401v1-abstract-full" style="display: none;"> Measurements of circular polarization of $纬$-ray emitted from neutron capture reactions provide valuable information for nuclear physics studies. The spin and parity of excited states can be determined by measuring the circular polarization from polarized neutron capture reactions. Furthermore, the $纬$-ray circular polarization in a neutron capture resonance is crucial for studying the enhancement effect of parity nonconservation in compound nuclei. The $纬$-ray circular polarization can be measured using a polarimeter based on magnetic Compton scattering. A polarimeter was constructed, and its performance indicators were evaluated using a circularly polarized $纬$-ray beam. Furthermore, as a demonstration, the $纬$-ray circular polarization was measured in $^{32}$S($\vec{\textrm{n}}$,$纬$)$^{33}$S reactions with polarized neutrons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.15401v1-abstract-full').style.display = 'none'; document.getElementById('2406.15401v1-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, 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">10pages, 13 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/2403.18313">arXiv:2403.18313</a> <span> [<a href="https://arxiv.org/pdf/2403.18313">pdf</a>, <a href="https://arxiv.org/format/2403.18313">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> </div> </div> <p class="title is-5 mathjax"> Demonstration of Near-Epithermal Neutron Reflective Optics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fujiie%2C+T">Takuhiro Fujiie</a>, <a href="/search/physics?searchtype=author&query=Abe%2C+R">Ryota Abe</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">Masahiro Hino</a>, <a href="/search/physics?searchtype=author&query=Hishida%2C+M">Mayu Hishida</a>, <a href="/search/physics?searchtype=author&query=Hosobata%2C+T">Takuya Hosobata</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Nakabe%2C+R">Rintaro Nakabe</a>, <a href="/search/physics?searchtype=author&query=Oikawa%2C+K">Kenichi Oikawa</a>, <a href="/search/physics?searchtype=author&query=Okudaira%2C+T">Takuya Okudaira</a>, <a href="/search/physics?searchtype=author&query=Parker%2C+J+D">Joseph D. Parker</a>, <a href="/search/physics?searchtype=author&query=Sakai%2C+K">Kenji Sakai</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">Hirohiko M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Tsuchikawa%2C+Y">Yusuke Tsuchikawa</a>, <a href="/search/physics?searchtype=author&query=Yamagata%2C+Y">Yutaka Yamagata</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="2403.18313v1-abstract-short" style="display: inline;"> Specular reflection of neutrons on material surfaces has been demonstrated in the energy range of 0.09-0.7 eV. The results suggest that the applicable energy range of reflective neutron optics can be extended to the near-epithermal region by using existing techniques. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.18313v1-abstract-full" style="display: none;"> Specular reflection of neutrons on material surfaces has been demonstrated in the energy range of 0.09-0.7 eV. The results suggest that the applicable energy range of reflective neutron optics can be extended to the near-epithermal region by using existing techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.18313v1-abstract-full').style.display = 'none'; document.getElementById('2403.18313v1-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> 27 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.12959">arXiv:2312.12959</a> <span> [<a href="https://arxiv.org/pdf/2312.12959">pdf</a>, <a href="https://arxiv.org/format/2312.12959">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="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Performance of the Fully-equipped Spin Flip Chopper For Neutron Lifetime Experiment at J-PARC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">G. Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Fuwa%2C+Y">Y. Fuwa</a>, <a href="/search/physics?searchtype=author&query=Hasegawa%2C+T">T. Hasegawa</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">M. Hino</a>, <a href="/search/physics?searchtype=author&query=Hosokawa%2C+R">R. Hosokawa</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">T. Ino</a>, <a href="/search/physics?searchtype=author&query=Iwashita%2C+Y">Y. Iwashita</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Matsuzaki%2C+S">S. Matsuzaki</a>, <a href="/search/physics?searchtype=author&query=Mogi%2C+T">T. Mogi</a>, <a href="/search/physics?searchtype=author&query=Okabe%2C+H">H. Okabe</a>, <a href="/search/physics?searchtype=author&query=Oku%2C+T">T. Oku</a>, <a href="/search/physics?searchtype=author&query=Okudaira%2C+T">T. Okudaira</a>, <a href="/search/physics?searchtype=author&query=Seki%2C+Y">Y. Seki</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+E">H. E. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Takahashi%2C+S">S. Takahashi</a>, <a href="/search/physics?searchtype=author&query=Tanida%2C+M">M. Tanida</a>, <a href="/search/physics?searchtype=author&query=Yamashita%2C+S">S. Yamashita</a>, <a href="/search/physics?searchtype=author&query=Yokohashi%2C+M">M. Yokohashi</a>, <a href="/search/physics?searchtype=author&query=Yoshioka%2C+T">T. Yoshioka</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="2312.12959v2-abstract-short" style="display: inline;"> To solve the ''neutron lifetime puzzle,'' where measured neutron lifetimes differ depending on the measurement methods, an experiment with pulsed neutron beam at J-PARC is in progress. In this experiment, neutrons are bunched into 40-cm lengths using a spin flip chopper (SFC), where the statistical sensitivity was limited by the aperture size of the SFC. The SFC comprises three sets of magnetic su… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.12959v2-abstract-full').style.display = 'inline'; document.getElementById('2312.12959v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.12959v2-abstract-full" style="display: none;"> To solve the ''neutron lifetime puzzle,'' where measured neutron lifetimes differ depending on the measurement methods, an experiment with pulsed neutron beam at J-PARC is in progress. In this experiment, neutrons are bunched into 40-cm lengths using a spin flip chopper (SFC), where the statistical sensitivity was limited by the aperture size of the SFC. The SFC comprises three sets of magnetic supermirrors and two resonant spin flippers. In this paper, we discuss an upgrade to enlarge the apertures of the SFC. With this upgrade, the statistics per unit time of the neutron lifetime experiment increased by a factor of 2.8, while maintaining a signal-to-noise ratio of 250-400 comparable to the previous one. Consequently, the time required to reach a precision of 1 s in the neutron lifetime experiment was reduced from 590 to 170 days, which is a significant reduction in time. This improvement in statistic will also contribute to the reduction of systematic uncertainties, such as background evaluation, fostering further advancements in the neutron lifetime experiments at J-PARC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.12959v2-abstract-full').style.display = 'none'; document.getElementById('2312.12959v2-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 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </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">33 pages, 22 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/2007.15302">arXiv:2007.15302</a> <span> [<a href="https://arxiv.org/pdf/2007.15302">pdf</a>, <a href="https://arxiv.org/ps/2007.15302">ps</a>, <a href="https://arxiv.org/format/2007.15302">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/10.1088/1748-0221/16/02/P02001">10.1088/1748-0221/16/02/P02001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of $纬$ rays from $^6$LiF tile as an inner wall of a neutron-decay detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Koga%2C+J">J. Koga</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/physics?searchtype=author&query=Kimura%2C+A">A. Kimura</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Kitahara%2C+R">R. Kitahara</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Nagakura%2C+N">N. Nagakura</a>, <a href="/search/physics?searchtype=author&query=Okudaira%2C+T">T. Okudaira</a>, <a href="/search/physics?searchtype=author&query=Otono%2C+H">H. Otono</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Sumi%2C+N">N. Sumi</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+S">S. Takada</a>, <a href="/search/physics?searchtype=author&query=Tomita%2C+T">T. Tomita</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+T">T. Yamada</a>, <a href="/search/physics?searchtype=author&query=Yoshioka%2C+T">T. Yoshioka</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="2007.15302v1-abstract-short" style="display: inline;"> A neutron lifetime measurement conducted at the Japan Proton Accelerator Research Complex (J-PARC) is counting the number of electrons from neutron decays with a time projection chamber (TPC). The $纬$ rays produced in the TPC cause irreducible background events. To achieve the precise measurement, the inner walls of the TPC consist of $^6$Li-enriched lithium-fluoride ($^6$LiF) tiles to suppress th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.15302v1-abstract-full').style.display = 'inline'; document.getElementById('2007.15302v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.15302v1-abstract-full" style="display: none;"> A neutron lifetime measurement conducted at the Japan Proton Accelerator Research Complex (J-PARC) is counting the number of electrons from neutron decays with a time projection chamber (TPC). The $纬$ rays produced in the TPC cause irreducible background events. To achieve the precise measurement, the inner walls of the TPC consist of $^6$Li-enriched lithium-fluoride ($^6$LiF) tiles to suppress the amount of $纬$ rays. In order to estimate the amount of $纬$ rays from the $^{6}{\rm LiF}$ tile, prompt gamma ray analysis (PGA) measurements were performed using germanium detectors. We reconstructed the measured $纬$-ray energy spectrum using a Monte Carlo simulation with the stripping method. Comparing the measured spectrum with a simulated one, the number of $纬$ rays emitted from the$^{6}{\rm LiF}$ tile was $(2.3^{+0.7}_{-0.3}) \times 10^{-4}$ per incident neutron. This is $1.4^{+0.5}_{-0.2}$ times the value assumed for a mole fraction of the $^{6}{\rm LiF}$ tile. We concluded that the amount of $纬$ rays produced from the $^{6}{\rm LiF}$ tile is not more twice the originally assumed value. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.15302v1-abstract-full').style.display = 'none'; document.getElementById('2007.15302v1-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 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">14 pages, 11 figures, will be submitted to JINST</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> KYUSHU-RCAPP-2020-02 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.14399">arXiv:2005.14399</a> <span> [<a href="https://arxiv.org/pdf/2005.14399">pdf</a>, <a href="https://arxiv.org/ps/2005.14399">ps</a>, <a href="https://arxiv.org/format/2005.14399">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> </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.2020.164301">10.1016/j.nima.2020.164301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development and application of a $^3$He Neutron Spin Filter at J-PARC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Okudaira%2C+T">T. Okudaira</a>, <a href="/search/physics?searchtype=author&query=Oku%2C+T">T. Oku</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">T. Ino</a>, <a href="/search/physics?searchtype=author&query=Hayashida%2C+H">H. Hayashida</a>, <a href="/search/physics?searchtype=author&query=Kira%2C+H">H. Kira</a>, <a href="/search/physics?searchtype=author&query=Sakai%2C+K">K. Sakai</a>, <a href="/search/physics?searchtype=author&query=Hiroi%2C+K">K. Hiroi</a>, <a href="/search/physics?searchtype=author&query=Takahashi%2C+S">S. Takahashi</a>, <a href="/search/physics?searchtype=author&query=Aizawa%2C+K">K. Aizawa</a>, <a href="/search/physics?searchtype=author&query=Endo%2C+H">H. Endo</a>, <a href="/search/physics?searchtype=author&query=Endo%2C+S">S. Endo</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">M. Hino</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">K. Hirota</a>, <a href="/search/physics?searchtype=author&query=Honda%2C+T">T. Honda</a>, <a href="/search/physics?searchtype=author&query=Ikeda%2C+K">K. Ikeda</a>, <a href="/search/physics?searchtype=author&query=Kakurai%2C+K">K. Kakurai</a>, <a href="/search/physics?searchtype=author&query=Kambara%2C+W">W. Kambara</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Oda%2C+T">T. Oda</a>, <a href="/search/physics?searchtype=author&query=Ohshita%2C+H">H. Ohshita</a>, <a href="/search/physics?searchtype=author&query=Otomo%2C+T">T. Otomo</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Shinohara%2C+T">T. Shinohara</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+J">J. Suzuki</a>, <a href="/search/physics?searchtype=author&query=Yamamoto%2C+T">T. 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="2005.14399v1-abstract-short" style="display: inline;"> We are developing a neutron polarizer with polarized $^3$He gas, referred to as a $^3$He spin filter, based on the Spin Exchange Optical Pumping (SEOP) for polarized neutron scattering experiments at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). A $^3$He gas-filling station was constructed at J-PARC, and several $^3$He cells with long… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.14399v1-abstract-full').style.display = 'inline'; document.getElementById('2005.14399v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.14399v1-abstract-full" style="display: none;"> We are developing a neutron polarizer with polarized $^3$He gas, referred to as a $^3$He spin filter, based on the Spin Exchange Optical Pumping (SEOP) for polarized neutron scattering experiments at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). A $^3$He gas-filling station was constructed at J-PARC, and several $^3$He cells with long spin relaxation times have been fabricated using the gas-filling station. A laboratory has been prepared in the MLF beam hall for polarizing $^3$He cells, and compact pumping systems with laser powers of 30~W and 110~W, which can be installed onto a neutron beamline, have been developed. A $^3$He polarization of 85% was achieved at a neutron beamline by using the pumping system with the 110~W laser. Recently, the first user experiment utilizing the $^3$He spin filter was conducted, and there have been several more since then. The development and utilization of $^3$He spin filters at MLF of J-PARC are reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.14399v1-abstract-full').style.display = 'none'; document.getElementById('2005.14399v1-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 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">9 pages, 15 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/2002.08655">arXiv:2002.08655</a> <span> [<a href="https://arxiv.org/pdf/2002.08655">pdf</a>, <a href="https://arxiv.org/format/2002.08655">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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 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.101.064624">10.1103/PhysRevC.101.064624 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transverse asymmetry of $纬$ rays from neutron-induced compound states of ${}^{140}{\rm La}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yamamoto%2C+T">T. Yamamoto</a>, <a href="/search/physics?searchtype=author&query=Okudaira%2C+T">T. Okudaira</a>, <a href="/search/physics?searchtype=author&query=Endo%2C+S">S. Endo</a>, <a href="/search/physics?searchtype=author&query=Fujioka%2C+H">H. Fujioka</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">K. Hirota</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">T. Ino</a>, <a href="/search/physics?searchtype=author&query=Ishizaki%2C+K">K. Ishizaki</a>, <a href="/search/physics?searchtype=author&query=Kimura%2C+A">A. Kimura</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Koga%2C+J">J. Koga</a>, <a href="/search/physics?searchtype=author&query=Makise%2C+S">S. Makise</a>, <a href="/search/physics?searchtype=author&query=Niinomi%2C+Y">Y. Niinomi</a>, <a href="/search/physics?searchtype=author&query=Oku%2C+T">T. Oku</a>, <a href="/search/physics?searchtype=author&query=Sakai%2C+K">K. Sakai</a>, <a href="/search/physics?searchtype=author&query=Shima%2C+T">T. Shima</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Takada%2C+S">S. Takada</a>, <a href="/search/physics?searchtype=author&query=Tani%2C+Y">Y. Tani</a>, <a href="/search/physics?searchtype=author&query=Yoshikawa%2C+H">H. Yoshikawa</a>, <a href="/search/physics?searchtype=author&query=Yoshioka%2C+T">T. Yoshioka</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="2002.08655v1-abstract-short" style="display: inline;"> A correlation term ${{ 蟽}_{n} }\cdot ({ k_{n}\times k_纬}) $ in the ${}^{139}{\rm La}(\vec{n},纬)$ reaction has been studied utilizing epithermal polarized neutrons and germanium detectors. The transverse asymmetry for single $纬$-ray transition was measured to be $0.60\pm0.19$ in the $p$-wave resonance. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.08655v1-abstract-full" style="display: none;"> A correlation term ${{ 蟽}_{n} }\cdot ({ k_{n}\times k_纬}) $ in the ${}^{139}{\rm La}(\vec{n},纬)$ reaction has been studied utilizing epithermal polarized neutrons and germanium detectors. The transverse asymmetry for single $纬$-ray transition was measured to be $0.60\pm0.19$ in the $p$-wave resonance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.08655v1-abstract-full').style.display = 'none'; document.getElementById('2002.08655v1-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> 20 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 101, 064624 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.05907">arXiv:1802.05907</a> <span> [<a href="https://arxiv.org/pdf/1802.05907">pdf</a>, <a href="https://arxiv.org/format/1802.05907">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</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/10.1016/j.physletb.2018.06.066">10.1016/j.physletb.2018.06.066 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Search for Possible Long Range Spin Dependent Interactions of the Neutron From Exotic Vector Boson Exchange </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Haddock%2C+C+C">Christopher C. Haddock</a>, <a href="/search/physics?searchtype=author&query=Amadio%2C+J">Joseph Amadio</a>, <a href="/search/physics?searchtype=author&query=Anderson%2C+E">Eamon Anderson</a>, <a href="/search/physics?searchtype=author&query=Barron-Palos%2C+L">Libertad Barron-Palos</a>, <a href="/search/physics?searchtype=author&query=Crawford%2C+B">Bret Crawford</a>, <a href="/search/physics?searchtype=author&query=Esposito%2C+D">Daniel Esposito</a>, <a href="/search/physics?searchtype=author&query=Fox%2C+W">Walter Fox</a>, <a href="/search/physics?searchtype=author&query=Francis%2C+I">Ian Francis</a>, <a href="/search/physics?searchtype=author&query=Fry%2C+J">Jason Fry</a>, <a href="/search/physics?searchtype=author&query=Gardiner%2C+H">Hanna Gardiner</a>, <a href="/search/physics?searchtype=author&query=Holley%2C+A">Adam Holley</a>, <a href="/search/physics?searchtype=author&query=Korsak%2C+K">Kirill Korsak</a>, <a href="/search/physics?searchtype=author&query=Lieffers%2C+J">Justin Lieffers</a>, <a href="/search/physics?searchtype=author&query=Magers%2C+S">Scott Magers</a>, <a href="/search/physics?searchtype=author&query=Maldonado-Velazquez%2C+M">Marissa Maldonado-Velazquez</a>, <a href="/search/physics?searchtype=author&query=Mayorov%2C+D">Dimitry Mayorov</a>, <a href="/search/physics?searchtype=author&query=Nico%2C+J">Jefferey Nico</a>, <a href="/search/physics?searchtype=author&query=Okudaira%2C+T">Takuya Okudaira</a>, <a href="/search/physics?searchtype=author&query=Paudel%2C+C">Churamani Paudel</a>, <a href="/search/physics?searchtype=author&query=Santra%2C+S">Satyaranjan Santra</a>, <a href="/search/physics?searchtype=author&query=Sarsour%2C+M">Murad Sarsour</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">Hirohiko M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Snow%2C+W+M">William M. Snow</a>, <a href="/search/physics?searchtype=author&query=Sprow%2C+A">Aaron Sprow</a>, <a href="/search/physics?searchtype=author&query=Steffen%2C+K">Kyle Steffen</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="1802.05907v3-abstract-short" style="display: inline;"> We present a search for possible spin dependent interactions of the neutron with matter through exchange of spin 1 bosons with axial vector couplings as envisioned in possible extensions of the Standard Model. This was sought using a slow neutron polarimeter that passed transversely polarized slow neutrons by unpolarized slabs of material arranged so that this interaction would tilt the plane of p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05907v3-abstract-full').style.display = 'inline'; document.getElementById('1802.05907v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.05907v3-abstract-full" style="display: none;"> We present a search for possible spin dependent interactions of the neutron with matter through exchange of spin 1 bosons with axial vector couplings as envisioned in possible extensions of the Standard Model. This was sought using a slow neutron polarimeter that passed transversely polarized slow neutrons by unpolarized slabs of material arranged so that this interaction would tilt the plane of polarization and develop a component along the neutron momentum. The result for the rotation angle, $蠁'_{V_5} = [2.8\pm\,4.6(stat.)\pm\,4.0(sys.)]\times 10^{-5}~\mbox{rad/m}$ is consistent with zero. This result improves the upper bounds on the neutron-matter coupling $g_{A}^{2}$ from such an interaction by about three orders of magnitude for force ranges in the mm-$渭$m regime. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.05907v3-abstract-full').style.display = 'none'; document.getElementById('1802.05907v3-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 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 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">10 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 783 (2018) 227-233 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.02503">arXiv:1712.02503</a> <span> [<a href="https://arxiv.org/pdf/1712.02503">pdf</a>, <a href="https://arxiv.org/ps/1712.02503">ps</a>, <a href="https://arxiv.org/format/1712.02503">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> </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/10.1088/1748-0221/13/02/P02018">10.1088/1748-0221/13/02/P02018 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Characterization of Germanium Detectors for the Measurement of the Angular Distribution of Prompt gamma-rays at the ANNRI in the MLF of the J-PARC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Takada%2C+S">Shusuke Takada</a>, <a href="/search/physics?searchtype=author&query=Okudaira%2C+T">Takuya Okudaira</a>, <a href="/search/physics?searchtype=author&query=Goto%2C+F">Fumiya Goto</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">Katsuya Hirota</a>, <a href="/search/physics?searchtype=author&query=Kimura%2C+A">Atsushi Kimura</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Koga%2C+J">Jun Koga</a>, <a href="/search/physics?searchtype=author&query=Nakao%2C+T">Taro Nakao</a>, <a href="/search/physics?searchtype=author&query=Sakai%2C+K">Kenji Sakai</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">Hirohiko M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Yamamoto%2C+T">Tomoki Yamamoto</a>, <a href="/search/physics?searchtype=author&query=Yoshioka%2C+T">Tamaki Yoshioka</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="1712.02503v1-abstract-short" style="display: inline;"> In this study, the germanium detector assembly, installed at the Accurate Neutron-Nuclear Reaction measurement Instruments (ANNRI) in the Material and Life Science Facility (MLF) operated by the Japan Proton Accelerator Research Complex (J-PARC), has been characterized for extension to the measurement of the angular distribution of individual gamma-ray transitions from neutron-induced compound sta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.02503v1-abstract-full').style.display = 'inline'; document.getElementById('1712.02503v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.02503v1-abstract-full" style="display: none;"> In this study, the germanium detector assembly, installed at the Accurate Neutron-Nuclear Reaction measurement Instruments (ANNRI) in the Material and Life Science Facility (MLF) operated by the Japan Proton Accelerator Research Complex (J-PARC), has been characterized for extension to the measurement of the angular distribution of individual gamma-ray transitions from neutron-induced compound states. We have developed a Monte Carlo simulation code using the GEANT4 toolkit, which can reproduce the pulse-height spectra of gamma-rays from radioactive sources and (n,gamma) reactions. The simulation is applicable to the measurement of gamma-rays in the energy region of 0.5-11.0 MeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.02503v1-abstract-full').style.display = 'none'; document.getElementById('1712.02503v1-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> 7 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a 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