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<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/2408.10929">arXiv:2408.10929</a> <span> [<a href="https://arxiv.org/pdf/2408.10929">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> </div> </div> <p class="title is-5 mathjax"> A Comparative Study of Neutron Irradiation for Genetic Mutations: Spallation, Reactor, and Compact Neutron Source </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sweet%2C+M">May Sweet</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Harada%2C+M">Masahide Harada</a>, <a href="/search/physics?searchtype=author&query=Kurita%2C+K">Keisuke Kurita</a>, <a href="/search/physics?searchtype=author&query=Iikura%2C+H">Hiroshi Iikura</a>, <a href="/search/physics?searchtype=author&query=Tasaki%2C+S">Seiji Tasaki</a>, <a href="/search/physics?searchtype=author&query=Kikuchi%2C+N">Norio Kikuchi</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="2408.10929v1-abstract-short" style="display: inline;"> Neutron beam, being electrically neutral and highly penetrating, offers unique advantages for irradiation of biological species such as plants, seeds, and microorganisms. We comprehensively investigate the potential of neutron irradiation for inducing genetic mutations using simulations of J-PARC BL10, JRR-3 TNRF, and KUANS for spallation, reactor, and compact neutron sources. We analyze neutron f… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.10929v1-abstract-full').style.display = 'inline'; document.getElementById('2408.10929v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.10929v1-abstract-full" style="display: none;"> Neutron beam, being electrically neutral and highly penetrating, offers unique advantages for irradiation of biological species such as plants, seeds, and microorganisms. We comprehensively investigate the potential of neutron irradiation for inducing genetic mutations using simulations of J-PARC BL10, JRR-3 TNRF, and KUANS for spallation, reactor, and compact neutron sources. We analyze neutron flux, energy deposition rates, and Linear Energy Transfer (LET) distributions. KUANS demonstrated the highest dose rate of 17 Gy/h, significantly surpassing BL10, due to the large solid angle by the optimal sample placement. The findings highlight KUANS's suitability for efficient genetic mutations and neutron breeding, particularly for inducing targeted mutations in biological samples. The LET range of KUANS is concentrated in 20-70 keV/渭m, which is potentially ideal for inducing specific genetic mutations. The importance of choosing neutron sources based on LET requirements to maximize mutation induction efficiency is emphasized. This research shows the potential of compact neutron sources like KUANS for effective biological irradiation and neutron breeding, offering a viable alternative to larger facilities. The neutron filters used in BL10 and TNRF effectively excluded low-energy neutrons with keeping the high LET component. The neutron capture reaction, 14N(n,p)14C, was found to be the main dose under thermal neutron-dominated conditions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.10929v1-abstract-full').style.display = 'none'; document.getElementById('2408.10929v1-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 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">18 pages, 6 Figures, 1 Table Category: physics.acc-ph (Accelerator Physics)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.15311">arXiv:2407.15311</a> <span> [<a href="https://arxiv.org/pdf/2407.15311">pdf</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 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/10.7566/JPSJ.93.091009">10.7566/JPSJ.93.091009 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Polarized cold-neutron reflectometry at JRR-3/MINE2 for the development of ultracold-neutron spin analyzers for a neutron EDM experiment at TRIUMF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Higuchi%2C+T">Takashi Higuchi</a>, <a href="/search/physics?searchtype=author&query=Akatsuka%2C+H">Hiroaki Akatsuka</a>, <a href="/search/physics?searchtype=author&query=Brossard%2C+A">Alexis Brossard</a>, <a href="/search/physics?searchtype=author&query=Fujimoto%2C+D">Derek Fujimoto</a>, <a href="/search/physics?searchtype=author&query=Giampa%2C+P">Pietro Giampa</a>, <a href="/search/physics?searchtype=author&query=Hansen-Romu%2C+S">Sean Hansen-Romu</a>, <a href="/search/physics?searchtype=author&query=Hatanaka%2C+K">Kichiji Hatanaka</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">Masahiro Hino</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">Go Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Imajo%2C+S">Sohei Imajo</a>, <a href="/search/physics?searchtype=author&query=Jamieson%2C+B">Blair Jamieson</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">Shinsuke Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Mammei%2C+R">Russell Mammei</a>, <a href="/search/physics?searchtype=author&query=Matsumiya%2C+R">Ryohei Matsumiya</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Picker%2C+R">R眉diger Picker</a>, <a href="/search/physics?searchtype=author&query=Schreyer%2C+W">Wolfgang Schreyer</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">Hirohiko M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Sidhu%2C+S">Steve Sidhu</a>, <a href="/search/physics?searchtype=author&query=Vanbergen%2C+S">Sean Vanbergen</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="2407.15311v2-abstract-short" style="display: inline;"> The neutron electric dipole moment (EDM) is a sensitive probe for currently undiscovered sources of charge-parity symmetry violation. As part of the TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration, we are developing spin analyzers for ultracold neutrons (UCNs) to be used for a next-generation experiment to measure the neutron EDM with unprecedented precision. Spin-state analysis of UCNs co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.15311v2-abstract-full').style.display = 'inline'; document.getElementById('2407.15311v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.15311v2-abstract-full" style="display: none;"> The neutron electric dipole moment (EDM) is a sensitive probe for currently undiscovered sources of charge-parity symmetry violation. As part of the TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration, we are developing spin analyzers for ultracold neutrons (UCNs) to be used for a next-generation experiment to measure the neutron EDM with unprecedented precision. Spin-state analysis of UCNs constitutes an essential part of the neutron EDM measurement sequence. Magnetized iron films used as spin filters of UCNs are crucial experimental components, whose performance directly influences the statistical sensitivity of the measurement. To test such iron film spin filters, we propose the use of polarized cold-neutron reflectometry, in addition to conventional UCN transmission experiments. The new method provides information on iron film samples complementary to the UCN tests and accelerates the development cycles. We developed a collaborative effort to produce iron film spin filters and test them with cold and ultracold neutrons available at JRR-3/MINE2 and J-PARC/MLF BL05. In this article, we review the methods of neutron EDM measurements, discuss the complementarity of this new approach to test UCN spin filters, provide an overview of our related activities, and present the first results of polarized cold-neutron reflectometry recently conducted at the MINE2 beamline. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.15311v2-abstract-full').style.display = 'none'; document.getElementById('2407.15311v2-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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/2308.01922">arXiv:2308.01922</a> <span> [<a href="https://arxiv.org/pdf/2308.01922">pdf</a>, <a href="https://arxiv.org/format/2308.01922">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 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.132.023402">10.1103/PhysRevLett.132.023402 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of Neutron Interferometer using Multilayer Mirrors and Measurements of Neutron-Nuclear Scattering Length with Pulsed Neutron Source </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=Hino%2C+M">Masahiro Hino</a>, <a href="/search/physics?searchtype=author&query=Hosobata%2C+T">Takuya Hosobata</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">Go Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Seki%2C+Y">Yoshichika Seki</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">Hirohiko M. Shimizu</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="2308.01922v2-abstract-short" style="display: inline;"> This study entailed the successful deployment of a novel neutron interferometer that utilizes multilayer mirrors. The apparatus facilitates a precise evaluation of the wavelength dependence of interference fringes utilizing a pulsed neutron source. Our interferometer achieved an impressive precision of 0.02 rad within a 20-min of recording time. Compared to systems using silicon crystals, the meas… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.01922v2-abstract-full').style.display = 'inline'; document.getElementById('2308.01922v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.01922v2-abstract-full" style="display: none;"> This study entailed the successful deployment of a novel neutron interferometer that utilizes multilayer mirrors. The apparatus facilitates a precise evaluation of the wavelength dependence of interference fringes utilizing a pulsed neutron source. Our interferometer achieved an impressive precision of 0.02 rad within a 20-min of recording time. Compared to systems using silicon crystals, the measurement sensitivity was maintained even when using a simplified disturbance suppressor. By segregating beam paths entirely, we achieved successful measurements of neutron-nuclear scattering lengths across various samples. The values measured for Si, Al, and Ti were in agreement with those found in the literature, while V showed a disparity of 45%. This discrepancy may be attributable to impurities encountered in previous investigations. The accuracy of measurements can be enhanced further by mitigating systematic uncertainties that are associated with neutron wavelength, sample impurity, and thickness. This novel neutron interferometer enables us to measure fundamental parameters, such as the neutron-nuclear scattering length of materials, with a precision that surpasses that of conventional interferometers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.01922v2-abstract-full').style.display = 'none'; document.getElementById('2308.01922v2-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 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.15461">arXiv:2303.15461</a> <span> [<a href="https://arxiv.org/pdf/2303.15461">pdf</a>, <a href="https://arxiv.org/ps/2303.15461">ps</a>, <a href="https://arxiv.org/format/2303.15461">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 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.108.034605">10.1103/PhysRevC.108.034605 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A diffuse scattering model of ultracold neutrons on wavy surfaces </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Imajo%2C+S">S. Imajo</a>, <a href="/search/physics?searchtype=author&query=Akatsuka%2C+H">H. Akatsuka</a>, <a href="/search/physics?searchtype=author&query=Hatanaka%2C+K">K. Hatanaka</a>, <a href="/search/physics?searchtype=author&query=Higuchi%2C+T">T. Higuchi</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">G. Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">S. Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Mammei%2C+R">R. Mammei</a>, <a href="/search/physics?searchtype=author&query=Matsumiya%2C+R">R. Matsumiya</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Picker%2C+R">R. Picker</a>, <a href="/search/physics?searchtype=author&query=Schreyer%2C+W">W. Schreyer</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</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="2303.15461v2-abstract-short" style="display: inline;"> Metal tubes plated with nickel-phosphorus are used in many fundamental physics experiments using ultracold neutrons (UCN) because of their ease of fabrication. These tubes are usually polished to a average roughness of 25-150 nm. However, there is no scattering model that accurately describes UCN scattering on such a rough guide surface with a mean-square roughness larger than 5 nm. We therefore d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.15461v2-abstract-full').style.display = 'inline'; document.getElementById('2303.15461v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.15461v2-abstract-full" style="display: none;"> Metal tubes plated with nickel-phosphorus are used in many fundamental physics experiments using ultracold neutrons (UCN) because of their ease of fabrication. These tubes are usually polished to a average roughness of 25-150 nm. However, there is no scattering model that accurately describes UCN scattering on such a rough guide surface with a mean-square roughness larger than 5 nm. We therefore developed a scattering model for UCN in which scattering from random surface waviness with a size larger than the UCN wavelength is described by a microfacet Bidirectional Reflectance Distribution Function model (mf-BRDF model), and scattering from smaller structures by the Lambert's cosine law (Lambert model). For the surface waviness, we used the statistical distribution of surface slope measured by an atomic force microscope on a sample piece of guide tube as input of the model. This model was used to describe UCN transmission experiments conducted at the pulsed UCN source at J-PARC. In these experiments, a UCN beam collimated to a divergence angle smaller than $\pm 6^{\circ}$ was directed into a guide tube with a mean-square roughness of 6.4 nm to 17 nm at an oblique angle, and the UCN transport performance and its time-of-flight distribution were measured while changing the angle of incidence. The mf-BRDF model combined with the Lambert model with scattering probability $p_{L} = 0.039\pm0.003$ reproduced the experimental results well. We have thus established a procedure to evaluate the characteristics of UCN guide tubes with a surface roughness of approximately 10 nm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.15461v2-abstract-full').style.display = 'none'; document.getElementById('2303.15461v2-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, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">15 pages, 11 figures. Accepted for publication in PRC</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 108 (2023) 034605 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.01606">arXiv:2211.01606</a> <span> [<a href="https://arxiv.org/pdf/2211.01606">pdf</a>, <a href="https://arxiv.org/format/2211.01606">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.radmeas.2022.106863">10.1016/j.radmeas.2022.106863 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study on the reusability of fluorescent nuclear track detectors using optical bleaching </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Muneem%2C+A">Abdul Muneem</a>, <a href="/search/physics?searchtype=author&query=Yoshida%2C+J">Junya Yoshida</a>, <a href="/search/physics?searchtype=author&query=Ekawa%2C+H">Hiroyuki Ekawa</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">Masahiro Hino</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">Katsuya Hirota</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">Go Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Kasagi%2C+A">Ayumi Kasagi</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Kodaira%2C+S">Satoshi Kodaira</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Nabi%2C+J">Jameel-Un Nabi</a>, <a href="/search/physics?searchtype=author&query=Nakagawa%2C+M">Manami Nakagawa</a>, <a href="/search/physics?searchtype=author&query=Sakashita%2C+M">Michio Sakashita</a>, <a href="/search/physics?searchtype=author&query=Saito%2C+N">Norihito Saito</a>, <a href="/search/physics?searchtype=author&query=Saito%2C+T+R">Takehiko R. Saito</a>, <a href="/search/physics?searchtype=author&query=Wada%2C+S">Satoshi Wada</a>, <a href="/search/physics?searchtype=author&query=Yasuda%2C+N">Nakahiro Yasuda</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="2211.01606v1-abstract-short" style="display: inline;"> Fluorescent nuclear track detectors (FNTDs) based on Al${_2}$O${_3}$:C,Mg crystals are luminescent detectors that can be used for dosimetry and detection of charged particles and neutrons. These detectors can be utilised for imaging applications where a reasonably high track density, approximately of the order of 1 $\times$ $10^4$ tracks in an area of 100 $\times$ 100 $渭$m$^2$, is required. To inv… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.01606v1-abstract-full').style.display = 'inline'; document.getElementById('2211.01606v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.01606v1-abstract-full" style="display: none;"> Fluorescent nuclear track detectors (FNTDs) based on Al${_2}$O${_3}$:C,Mg crystals are luminescent detectors that can be used for dosimetry and detection of charged particles and neutrons. These detectors can be utilised for imaging applications where a reasonably high track density, approximately of the order of 1 $\times$ $10^4$ tracks in an area of 100 $\times$ 100 $渭$m$^2$, is required. To investigate the reusability of FNTDs for imaging applications, we present an approach to perform optical bleaching under the required track density conditions. The reusability was assessed through seven irradiation-bleaching cycles. For the irradiation, the studied FNTD was exposed to alpha-particles from an $^{241}$Am radioactive source. The optical bleaching was performed by means of ultraviolet laser light with a wavelength of 355 nm. Three dedicated regions on a single FNTD with different accumulated track densities and bleaching conditions were investigated. After every irradiation-bleaching cycle, signal-to-noise ratio was calculated to evaluate FNTD performance. It is concluded that FNTDs can be reused at least seven times for applications where accumulation of a high track density is required. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.01606v1-abstract-full').style.display = 'none'; document.getElementById('2211.01606v1-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 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.17026">arXiv:2210.17026</a> <span> [<a href="https://arxiv.org/pdf/2210.17026">pdf</a>, <a href="https://arxiv.org/format/2210.17026">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 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/10.1063/5.0131098">10.1063/5.0131098 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Investigation of the neutron imaging applications using fine-grained nuclear emulsion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Muneem%2C+A">Abdul Muneem</a>, <a href="/search/physics?searchtype=author&query=Yoshida%2C+J">Junya Yoshida</a>, <a href="/search/physics?searchtype=author&query=Ekawa%2C+H">Hiroyuki Ekawa</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">Masahiro Hino</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">Katsuya Hirota</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">Go Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Kasagi%2C+A">Ayumi Kasagi</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Muto%2C+N">Naoto Muto</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Nabi%2C+J">Jameel-Un Nabi</a>, <a href="/search/physics?searchtype=author&query=Nakagawa%2C+M">Manami Nakagawa</a>, <a href="/search/physics?searchtype=author&query=Naganawa%2C+N">Naotaka Naganawa</a>, <a href="/search/physics?searchtype=author&query=Saito%2C+T+R">Takehiko R. Saito</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="2210.17026v2-abstract-short" style="display: inline;"> Neutron imaging is a non-destructive inspection technique with a wide range of applications. One of the important aspects concerning neutron imaging is achieving micrometer-scale spatial resolution. Developing a neutron detector with a high resolution is a challenging task. Neutron detectors, based on fine-grained nuclear emulsion, may be suitable for high resolution neutron imaging applications.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.17026v2-abstract-full').style.display = 'inline'; document.getElementById('2210.17026v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.17026v2-abstract-full" style="display: none;"> Neutron imaging is a non-destructive inspection technique with a wide range of applications. One of the important aspects concerning neutron imaging is achieving micrometer-scale spatial resolution. Developing a neutron detector with a high resolution is a challenging task. Neutron detectors, based on fine-grained nuclear emulsion, may be suitable for high resolution neutron imaging applications. High track density is a necessary requirement to improve the quality of neutron imaging. However, the available track analysis methods are difficult to apply under high track density conditions. Simulated images were used to determine the required track density for neutron imaging. It was concluded that a track density of the order of $10^4$ tracks per 100 $\times$ 100 $渭$m$^2$ is sufficient to utilize neutron detectors for imaging applications. The contrast resolution was also investigated for the image data sets with various track densities and neutron transmission rates. Moreover, experiments were performed for neutron imaging of the gadolinium-based gratings with known geometries. The structure of gratings was successfully resolved. The calculated 1$蟽$ 10-90 \% edge response, using the gray scale optical images of the grating slit with a periodic structure of 9 $渭$m, was 0.945 $\pm$ 0.004 $渭$m. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.17026v2-abstract-full').style.display = 'none'; document.getElementById('2210.17026v2-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> 6 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.09880">arXiv:2207.09880</a> <span> [<a href="https://arxiv.org/pdf/2207.09880">pdf</a>, <a href="https://arxiv.org/ps/2207.09880">ps</a>, <a href="https://arxiv.org/format/2207.09880">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 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/10.7566/JPSCP.37.020701">10.7566/JPSCP.37.020701 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Precision nEDM Measurement with UltraCold Neutrons at TRIUMF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Matsumiya%2C+R">Ryohei Matsumiya</a>, <a href="/search/physics?searchtype=author&query=Akatsuka%2C+H">Hiroaki Akatsuka</a>, <a href="/search/physics?searchtype=author&query=Bidinosti%2C+C+P">Chris P. Bidinosti</a>, <a href="/search/physics?searchtype=author&query=Davis%2C+C+A">Charles A. Davis</a>, <a href="/search/physics?searchtype=author&query=Franke%2C+B">Beatrice Franke</a>, <a href="/search/physics?searchtype=author&query=Fujimoto%2C+D">Derek Fujimoto</a>, <a href="/search/physics?searchtype=author&query=Gericke%2C+M+T+W">Michael T. W. Gericke</a>, <a href="/search/physics?searchtype=author&query=Giampa%2C+P">Pietro Giampa</a>, <a href="/search/physics?searchtype=author&query=Golub%2C+R">Robert Golub</a>, <a href="/search/physics?searchtype=author&query=Hansen-Romu%2C+S">Sean Hansen-Romu</a>, <a href="/search/physics?searchtype=author&query=Hatanaka%2C+K">Kichiji Hatanaka</a>, <a href="/search/physics?searchtype=author&query=Hayamizu%2C+T">Tomohiro Hayamizu</a>, <a href="/search/physics?searchtype=author&query=Higuchi%2C+T">Takashi Higuchi</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">Go Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Imajo%2C+S">Sohei Imajo</a>, <a href="/search/physics?searchtype=author&query=Jamieson%2C+B">Blair Jamieson</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">Shinsuke Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Klassen%2C+W">Wolfgang Klassen</a>, <a href="/search/physics?searchtype=author&query=Klemets%2C+E">Emma Klemets</a>, <a href="/search/physics?searchtype=author&query=Konaka%2C+A">Akira Konaka</a>, <a href="/search/physics?searchtype=author&query=Korkmaz%2C+E">Elie Korkmaz</a>, <a href="/search/physics?searchtype=author&query=Korobkina%2C+E">Ekaterina Korobkina</a>, <a href="/search/physics?searchtype=author&query=Kuchler%2C+F">Florian Kuchler</a>, <a href="/search/physics?searchtype=author&query=Lavvaf%2C+M">Maedeh Lavvaf</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="2207.09880v1-abstract-short" style="display: inline;"> The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a precision neutron electric dipole moment (nEDM) measurement with an uncertainty of $10^{-27}\,e\cdot\mathrm{cm}$, which is an order-of-magnitude better than the current nEDM upper limit and enables us to test Supersymmetry. To achieve this precision, we are developing a new high-intensity ultracold neutron (UCN) source using su… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.09880v1-abstract-full').style.display = 'inline'; document.getElementById('2207.09880v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.09880v1-abstract-full" style="display: none;"> The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a precision neutron electric dipole moment (nEDM) measurement with an uncertainty of $10^{-27}\,e\cdot\mathrm{cm}$, which is an order-of-magnitude better than the current nEDM upper limit and enables us to test Supersymmetry. To achieve this precision, we are developing a new high-intensity ultracold neutron (UCN) source using super-thermal UCN production in superfluid helium (He-II) and a nEDM spectrometer. The current development status of them is reported in this article. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.09880v1-abstract-full').style.display = 'none'; document.getElementById('2207.09880v1-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> 18 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">Proceedings of the 24th International Spin Symposium (SPIN 2021), 18-22 October 2021, Matsue, Japan</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.08441">arXiv:2207.08441</a> <span> [<a href="https://arxiv.org/pdf/2207.08441">pdf</a>, <a href="https://arxiv.org/ps/2207.08441">ps</a>, <a href="https://arxiv.org/format/2207.08441">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 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/10.7566/JPSCP.37.020801">10.7566/JPSCP.37.020801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of Thin Iron Films for Polarization Analysis of Ultracold Neutrons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Akatsuka%2C+H">Hiroaki Akatsuka</a>, <a href="/search/physics?searchtype=author&query=Higuchi%2C+T">Takashi Higuchi</a>, <a href="/search/physics?searchtype=author&query=Hansen-Romu%2C+S">Sean Hansen-Romu</a>, <a href="/search/physics?searchtype=author&query=Hatanaka%2C+K">Kichiji Hatanaka</a>, <a href="/search/physics?searchtype=author&query=Hayamizu%2C+T">Tomohiro Hayamizu</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">Masahiro Hino</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">Go Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Imajo%2C+S">Sohei Imajo</a>, <a href="/search/physics?searchtype=author&query=Jamieson%2C+B">Blair Jamieson</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">Shinsuke Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Matsumiya%2C+R">Ryohei Matsumiya</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</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="2207.08441v1-abstract-short" style="display: inline;"> The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) collaboration aims to search for the neutron electric dipole moment (nEDM) with unprecedented precision. One of the essential elements for the nEDM measurement is a polarization analyzer of ultracold neutrons (UCNs), whose main component is a magnetized thin iron film. Several thin iron films were deposited on aluminum and silicon ubstrates and were c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.08441v1-abstract-full').style.display = 'inline'; document.getElementById('2207.08441v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.08441v1-abstract-full" style="display: none;"> The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) collaboration aims to search for the neutron electric dipole moment (nEDM) with unprecedented precision. One of the essential elements for the nEDM measurement is a polarization analyzer of ultracold neutrons (UCNs), whose main component is a magnetized thin iron film. Several thin iron films were deposited on aluminum and silicon ubstrates and were characterized by vibrating sample magnetometry and cold-neutron reflectometry. A magnetic field required to saturate the iron film is $\sim$12 kA/m for those on the aluminum substrates and 6.4 kA/m for the silicon substrates. The magnetic potential of the iron films on the Si substrate was estimated to be 2 T by the neutron reflectometry, which is sufficient performance for an UCN polarization analyzer of the nEDM measurement. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.08441v1-abstract-full').style.display = 'none'; document.getElementById('2207.08441v1-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> 18 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">Proceedings of the 24th International Spin Symposium (SPIN 2021), 18-22 October 2021, Matsue, Japan</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.04346">arXiv:2201.04346</a> <span> [<a href="https://arxiv.org/pdf/2201.04346">pdf</a>, <a href="https://arxiv.org/ps/2201.04346">ps</a>, <a href="https://arxiv.org/format/2201.04346">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="Quantum Physics">quant-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/10.1088/1748-0221/17/07/P07014">10.1088/1748-0221/17/07/P07014 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Novel Nuclear Emulsion Detector for Measurement of Quantum States of Ultracold Neutrons in the Earth's Gravitational Field </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Muto%2C+N">Naoto Muto</a>, <a href="/search/physics?searchtype=author&query=Abele%2C+H">Hartmut Abele</a>, <a href="/search/physics?searchtype=author&query=Ariga%2C+T">Tomoko Ariga</a>, <a href="/search/physics?searchtype=author&query=Bosina%2C+J">Joachim Bosina</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">Masahiro Hino</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">Katsuya Hirota</a>, <a href="/search/physics?searchtype=author&query=Ichikawa%2C+G">Go Ichikawa</a>, <a href="/search/physics?searchtype=author&query=Jenke%2C+T">Tobias Jenke</a>, <a href="/search/physics?searchtype=author&query=Kawahara%2C+H">Hiroaki Kawahara</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">Shinsuke Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Micko%2C+J">Jakob Micko</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Naganawa%2C+N">Naotaka Naganawa</a>, <a href="/search/physics?searchtype=author&query=Nakamura%2C+M">Mitsuhiro Nakamura</a>, <a href="/search/physics?searchtype=author&query=Roccia%2C+S">St茅phanie Roccia</a>, <a href="/search/physics?searchtype=author&query=Sato%2C+O">Osamu Sato</a>, <a href="/search/physics?searchtype=author&query=Sedmik%2C+R+I+P">Ren茅 I. P. Sedmik</a>, <a href="/search/physics?searchtype=author&query=Seki%2C+Y">Yoshichika Seki</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">Hirohiko M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Tada%2C+S">Satomi Tada</a>, <a href="/search/physics?searchtype=author&query=Umemoto%2C+A">Atsuhiro Umemoto</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="2201.04346v2-abstract-short" style="display: inline;"> Hypothetical short-range interactions could be detected by measuring the wavefunctions of ultracold neutrons (UCNs) on a mirror bounded by the Earth's gravitational field. The Searches require detectors with higher spatial resolution. We are developing a UCN detector for the with a high spatial resolution, which consists of a Si substrate, a thin converter layer including $^{10}$B$_{4}$C, and a la… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.04346v2-abstract-full').style.display = 'inline'; document.getElementById('2201.04346v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.04346v2-abstract-full" style="display: none;"> Hypothetical short-range interactions could be detected by measuring the wavefunctions of ultracold neutrons (UCNs) on a mirror bounded by the Earth's gravitational field. The Searches require detectors with higher spatial resolution. We are developing a UCN detector for the with a high spatial resolution, which consists of a Si substrate, a thin converter layer including $^{10}$B$_{4}$C, and a layer of fine-grained nuclear emulsion. Its resolution was estimated to be less than 100 nm by fitting tracks of either $^{7}$Li nuclei or $伪$-particles, which were created when neutrons interacted with the $^{10}$B$_{4}$C layer. For actual measurements of the spatial distributions, the following two improvements were made: The first was to establish a method to align microscopic images with high accuracy within a wide region of 65 mm $\times$ 0.2 mm. We created reference marks of 1 $渭$m and 5 $渭$m diameter with an interval of 50 $渭$m and 500 $渭$m, respectively, on the Si substrate by electron beam lithography and realized a position accuracy of less than 30 nm. The second was to build a holder that could maintain the atmospheric pressure around the nuclear emulsion to utilize it under vacuum during exposure to UCNs. The intrinsic resolution of the improved detector was estimated by evaluating the blur of a transmission image of a gadolinium grating taken by cold neutrons as better than 0.56 $\pm$ 0.08 $渭$m, which included the grating accuracy. A test exposure to UCNs was conducted to obtain the spatial distribution of UCNs in the Earth's gravitational field. Although the test was successful, a blurring of 6.9 $渭$m was found in the measurements, compared with a theoretical curve. We identified the blurring caused by the refraction of UCNs due to the roughness of the upstream surface of the substrate. Polishing of the surface makes the resolution less than 100 nm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.04346v2-abstract-full').style.display = 'none'; document.getElementById('2201.04346v2-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> 26 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </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/1912.08073">arXiv:1912.08073</a> <span> [<a href="https://arxiv.org/pdf/1912.08073">pdf</a>, <a href="https://arxiv.org/format/1912.08073">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> <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.2020.163525">10.1016/j.nima.2020.163525 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Optimizing neutron moderators for a spallation-driven ultracold-neutron source at TRIUMF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Schreyer%2C+W">W. Schreyer</a>, <a href="/search/physics?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">S. Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Kikawa%2C+T">T. Kikawa</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+C">C. Marshall</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Okamura%2C+T">T. Okamura</a>, <a href="/search/physics?searchtype=author&query=Picker%2C+R">R. Picker</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="1912.08073v2-abstract-short" style="display: inline;"> We report on our efforts to optimize the geometry of neutron moderators and converters for the TRIUMF UltraCold Advanced Neutron (TUCAN) source using MCNP simulations. It will use an existing spallation neutron source driven by a 19.3 kW proton beam delivered by TRIUMF's 520 MeV cyclotron. Spallation neutrons will be moderated in heavy water at room temperature and in liquid deuterium at 20 K, and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.08073v2-abstract-full').style.display = 'inline'; document.getElementById('1912.08073v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.08073v2-abstract-full" style="display: none;"> We report on our efforts to optimize the geometry of neutron moderators and converters for the TRIUMF UltraCold Advanced Neutron (TUCAN) source using MCNP simulations. It will use an existing spallation neutron source driven by a 19.3 kW proton beam delivered by TRIUMF's 520 MeV cyclotron. Spallation neutrons will be moderated in heavy water at room temperature and in liquid deuterium at 20 K, and then superthermally converted to ultracold neutrons in superfluid, isotopically purified $^4$He. The helium will be cooled by a $^3$He fridge through a $^3$He-$^4$He heat exchanger. The optimization took into account a range of engineering and safety requirements and guided the detailed design of the source. The predicted ultracold-neutron density delivered to a typical experiment is maximized for a production volume of 27 L, achieving a production rate of $1.4 \cdot 10^7$ s$^{-1}$ to $1.6 \cdot 10^7$ s$^{-1}$ with a heat load of 8.1 W. At that heat load, the fridge can cool the superfluid helium to 1.1 K, resulting in a storage lifetime for ultracold neutrons in the source of about 30 s. The most critical performance parameters are the choice of cold moderator and the volume, thickness, and material of the vessel containing the superfluid helium. The source is scheduled to be installed in 2021 and will enable the TUCAN collaboration to measure the electric dipole moment of the neutron with a sensitivity of $10^{-27}$ e cm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.08073v2-abstract-full').style.display = 'none'; document.getElementById('1912.08073v2-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, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1904.11893">arXiv:1904.11893</a> <span> [<a href="https://arxiv.org/pdf/1904.11893">pdf</a>, <a href="https://arxiv.org/ps/1904.11893">ps</a>, <a href="https://arxiv.org/format/1904.11893">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> <p class="title is-5 mathjax"> Improved determination of thermal cross section of 14N(n,p)14C for the neutron lifetime measurement </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kitahara%2C+R">R. Kitahara</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">K. Hirota</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+S">S. Ieki</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=Koga%2C+J">J. Koga</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Morishita%2C+A">A. Morishita</a>, <a href="/search/physics?searchtype=author&query=Nagakura%2C+N">N. Nagakura</a>, <a href="/search/physics?searchtype=author&query=Oide%2C+H">H. Oide</a>, <a href="/search/physics?searchtype=author&query=Otono%2C+H">H. Otono</a>, <a href="/search/physics?searchtype=author&query=Seki%2C+Y">Y. Seki</a>, <a href="/search/physics?searchtype=author&query=Sekiba%2C+D">D. Sekiba</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=Sumi%2C+N">N. Sumi</a>, <a href="/search/physics?searchtype=author&query=Sumino%2C+H">H. Sumino</a>, <a href="/search/physics?searchtype=author&query=Taketani%2C+K">K. Taketani</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=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="1904.11893v4-abstract-short" style="display: inline;"> In a neutron lifetime measurement at the Japan Proton Accelerator Complex, the neutron lifetime is calculated by the neutron decay rate and the incident neutron flux. The flux is obtained due to counting the protons emitted from the neutron absorption reaction of ${}^{3}{\rm He}$ gas, which is diluted in a mixture of working gas in a detector. Hence, it is crucial to determine the amount of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.11893v4-abstract-full').style.display = 'inline'; document.getElementById('1904.11893v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1904.11893v4-abstract-full" style="display: none;"> In a neutron lifetime measurement at the Japan Proton Accelerator Complex, the neutron lifetime is calculated by the neutron decay rate and the incident neutron flux. The flux is obtained due to counting the protons emitted from the neutron absorption reaction of ${}^{3}{\rm He}$ gas, which is diluted in a mixture of working gas in a detector. Hence, it is crucial to determine the amount of ${}^{3}{\rm He}$ in the mixture. In order to improve the accuracy of the number density of the ${}^{3}{\rm He}$ nuclei, we suggested to use the ${}^{14}{\rm N}({\rm n},{\rm p}){}^{14}{\rm C}$ reaction as a reference because this reaction involves similar kinetic energy as the ${}^{3}{\rm He}({\rm n},{\rm p}){}^{3}{\rm H}$ reaction and a smaller reaction cross section to introduce reasonable large partial pressure. The uncertainty of the recommended value of the cross section, however, is not satisfied with our requirement. In this paper, we report the most accurate experimental value of the cross section of the ${}^{14}{\rm N}({\rm n},{\rm p}){}^{14}{\rm C}$ reaction at a neutron velocity of 2200 m/s, measured relative to the ${}^{3}{\rm He}({\rm n},{\rm p}){}^{3}{\rm H}$ reaction. The result was 1.868 $\pm$ 0.003 (stat.) $\pm$ 0.006 (sys.) b. Additionally, the cross section of the ${}^{17}{\rm O}({\rm n},{\rm 伪}){}^{14}{\rm C}$ reaction at the neutron velocity is also redetermined as 249 $\pm$ 6 mb. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1904.11893v4-abstract-full').style.display = 'none'; document.getElementById('1904.11893v4-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> 2 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">22 pages, 11 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> KYUSHU-RCAPP-2018-04 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.03784">arXiv:1811.03784</a> <span> [<a href="https://arxiv.org/pdf/1811.03784">pdf</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 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/10.1051/epjconf/201921910005">10.1051/epjconf/201921910005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Neutron scattering cross section of diamond nanoparticle </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Otomoa%2C+T">Toshiya Otomoa</a>, <a href="/search/physics?searchtype=author&query=Ikeda%2C+K">Kazutaka Ikeda</a>, <a href="/search/physics?searchtype=author&query=Ohshita%2C+H">Hidetoshi Ohshita</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="1811.03784v3-abstract-short" style="display: inline;"> Due to their large coherent scattering cross section, diamond nanoparticles (DNPs) are considered as a promising candidate material for a new neutron reflector. For investigation of scattering cross sections of packed samples, we have developed a technique for mechanical compression of DNP powder. Application of 220 MPa allowed us to increase the bulk density from 0.40 g/cm$^3$ to 1.1 g/cm$^3$. Th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.03784v3-abstract-full').style.display = 'inline'; document.getElementById('1811.03784v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.03784v3-abstract-full" style="display: none;"> Due to their large coherent scattering cross section, diamond nanoparticles (DNPs) are considered as a promising candidate material for a new neutron reflector. For investigation of scattering cross sections of packed samples, we have developed a technique for mechanical compression of DNP powder. Application of 220 MPa allowed us to increase the bulk density from 0.40 g/cm$^3$ to 1.1 g/cm$^3$. The differential cross sections of uncompressed and packed samples were measured using the high-intensity total diffractometer instrument NOVA at J-PARC, covering transfer wavenumbers (q) from 0.6 to 100 nm$^{-1}$. The q dependence for the compressed sample agreed with the theoretical expectation derived from the Born approximation applied to homogeneous spheres with inclusion of a hard-sphere model to account for the inter-particle structure, whereas the results obtained from the powder sample disagreed. This implies that the theoretical description does not well represent the mesoscopic structure of the DNP powder sample. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.03784v3-abstract-full').style.display = 'none'; document.getElementById('1811.03784v3-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 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">6 pages, 10 figures, Proceedings of International Workshop on Particle Physics at Neutron Sources 2018 (PPNS2018)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1809.04071">arXiv:1809.04071</a> <span> [<a href="https://arxiv.org/pdf/1809.04071">pdf</a>, <a href="https://arxiv.org/format/1809.04071">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 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.99.025503">10.1103/PhysRevC.99.025503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First ultracold neutrons produced at TRIUMF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ahmed%2C+S">S. Ahmed</a>, <a href="/search/physics?searchtype=author&query=Altiere%2C+E">E. Altiere</a>, <a href="/search/physics?searchtype=author&query=Andalib%2C+T">T. Andalib</a>, <a href="/search/physics?searchtype=author&query=Bell%2C+B">B. Bell</a>, <a href="/search/physics?searchtype=author&query=Bidinosti%2C+C+P">C. P. Bidinosti</a>, <a href="/search/physics?searchtype=author&query=Cudmore%2C+E">E. Cudmore</a>, <a href="/search/physics?searchtype=author&query=Das%2C+M">M. Das</a>, <a href="/search/physics?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/physics?searchtype=author&query=Franke%2C+B">B. Franke</a>, <a href="/search/physics?searchtype=author&query=Gericke%2C+M">M. Gericke</a>, <a href="/search/physics?searchtype=author&query=Giampa%2C+P">P. Giampa</a>, <a href="/search/physics?searchtype=author&query=Gnyp%2C+P">P. Gnyp</a>, <a href="/search/physics?searchtype=author&query=Hansen-Romu%2C+S">S. Hansen-Romu</a>, <a href="/search/physics?searchtype=author&query=Hatanaka%2C+K">K. Hatanaka</a>, <a href="/search/physics?searchtype=author&query=Hayamizu%2C+T">T. Hayamizu</a>, <a href="/search/physics?searchtype=author&query=Jamieson%2C+B">B. Jamieson</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+D">D. Jones</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">S. Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Kikawa%2C+T">T. Kikawa</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Klassen%2C+W">W. Klassen</a>, <a href="/search/physics?searchtype=author&query=Konaka%2C+A">A. Konaka</a>, <a href="/search/physics?searchtype=author&query=Korkmaz%2C+E">E. Korkmaz</a>, <a href="/search/physics?searchtype=author&query=Kuchler%2C+F">F. Kuchler</a>, <a href="/search/physics?searchtype=author&query=Lang%2C+M">M. Lang</a> , et al. (28 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="1809.04071v3-abstract-short" style="display: inline;"> We installed a source for ultracold neutrons at a new, dedicated spallation target at TRIUMF. The source was originally developed in Japan and uses a superfluid-helium converter cooled to 0.9$\,$K. During an extensive test campaign in November 2017, we extracted up to 325000 ultracold neutrons after a one-minute irradiation of the target, over three times more than previously achieved with this so… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.04071v3-abstract-full').style.display = 'inline'; document.getElementById('1809.04071v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1809.04071v3-abstract-full" style="display: none;"> We installed a source for ultracold neutrons at a new, dedicated spallation target at TRIUMF. The source was originally developed in Japan and uses a superfluid-helium converter cooled to 0.9$\,$K. During an extensive test campaign in November 2017, we extracted up to 325000 ultracold neutrons after a one-minute irradiation of the target, over three times more than previously achieved with this source. The corresponding ultracold-neutron density in the whole production and guide volume is 5.3$\,$cm$^{-3}$. The storage lifetime of ultracold neutrons in the source was initially 37$\,$s and dropped to 24$\,$s during the eighteen days of operation. During continuous irradiation of the spallation target, we were able to detect a sustained ultracold-neutron rate of up to 1500$\,$s$^{-1}$. Simulations of UCN production, UCN transport, temperature-dependent UCN yield, and temperature-dependent storage lifetime show excellent agreement with the experimental data and confirm that the ultracold-neutron-upscattering rate in superfluid helium is proportional to $T^7$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1809.04071v3-abstract-full').style.display = 'none'; document.getElementById('1809.04071v3-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 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 September, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">8 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 99, 025503 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.08048">arXiv:1804.08048</a> <span> [<a href="https://arxiv.org/pdf/1804.08048">pdf</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="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/10.1029/2018GC007554">10.1029/2018GC007554 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Accurate determination of the absolute 3He/4He ratio of a synthesized helium standard gas (Helium Standard of Japan, HESJ): Towards revision of the atmospheric 3He/4He ratio </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Sumino%2C+H">Hirochika Sumino</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+T">Takahito Yamada</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+S">Sei Ieki</a>, <a href="/search/physics?searchtype=author&query=Nagakura%2C+N">Naoki Nagakura</a>, <a href="/search/physics?searchtype=author&query=Otono%2C+H">Hidetoshi Otono</a>, <a href="/search/physics?searchtype=author&query=Oide%2C+H">Hideyuki Oide</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="1804.08048v2-abstract-short" style="display: inline;"> The helium standard of Japan, referred to as HESJ, is an inter-laboratory standard for the 3He/4He ratio. While the ratio of 3He and 4He of the HESJ was previously determined by a relative comparison to atmospheric helium, the absolute value of the 3He/4He ratio of the HESJ has not been directly determined yet. Therefore, it relies on the early measurements of that of atmospheric helium. The accur… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.08048v2-abstract-full').style.display = 'inline'; document.getElementById('1804.08048v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.08048v2-abstract-full" style="display: none;"> The helium standard of Japan, referred to as HESJ, is an inter-laboratory standard for the 3He/4He ratio. While the ratio of 3He and 4He of the HESJ was previously determined by a relative comparison to atmospheric helium, the absolute value of the 3He/4He ratio of the HESJ has not been directly determined yet. Therefore, it relies on the early measurements of that of atmospheric helium. The accuracy of the absolute 3He/4He ratios of the atmosphere and other working standards including HESJ is crucial in some applications of helium isotopes, such as tritium-3He dating, surface-exposure age determination based on cosmogenic 3He, and the accurate measurement of the neutron lifetime. In this work, new control samples of helium gases with 3He/4He ratios of 14, 28, and 42 ppm were fabricated with accuracy of 0.25-0.38% using a gas-handling system for a neutron lifetime experiment at Japan Proton Accelerator Research Complex (J-PARC). The relative 3He/4He ratios of these samples and the HESJ were measured using a magnetic-sector-type, single-focusing, noble gas mass spectrometer with a double collector system. As a result, the absolute 3He/4He ratio of the HESJ was determined as 27.36 +/- 0.11 ppm. The atmospheric 3He/4He ratio was determined as 1.340 +/- 0.006 ppm, based on this work. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.08048v2-abstract-full').style.display = 'none'; document.getElementById('1804.08048v2-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> 2 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">18 pages, 8 figures, 4 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> KYUSHU-RCAPP-2018-03 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.00452">arXiv:1803.00452</a> <span> [<a href="https://arxiv.org/pdf/1803.00452">pdf</a>, <a href="https://arxiv.org/format/1803.00452">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/10.1140/epjc/s10052-018-6395-7">10.1140/epjc/s10052-018-6395-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Cold/Ultracold Neutron Detector using Fine-grained Nuclear Emulsion with Spatial Resolution less than 100 nm </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Naganawa%2C+N">N. Naganawa</a>, <a href="/search/physics?searchtype=author&query=Ariga%2C+T">T. Ariga</a>, <a href="/search/physics?searchtype=author&query=Awano%2C+S">S. Awano</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=Kawahara%2C+H">H. Kawahara</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Tada%2C+S">S. Tada</a>, <a href="/search/physics?searchtype=author&query=Tasaki%2C+S">S. Tasaki</a>, <a href="/search/physics?searchtype=author&query=Umemoto%2C+A">A. Umemoto</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="1803.00452v1-abstract-short" style="display: inline;"> A new type of cold/ultracold neutron detector that can realize a spatial resolution of less than 100 nm was developed using nuclear emulsion. The detector consists of a fine-grained nuclear emulsion coating and a 50-nm thick $^{10}$B$_4$C layer for the neutron conversion. The detector was exposed to cold and ultracold neutrons (UCNs) at the J-PARC. Detection efficiencies were measured as (0.16… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.00452v1-abstract-full').style.display = 'inline'; document.getElementById('1803.00452v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.00452v1-abstract-full" style="display: none;"> A new type of cold/ultracold neutron detector that can realize a spatial resolution of less than 100 nm was developed using nuclear emulsion. The detector consists of a fine-grained nuclear emulsion coating and a 50-nm thick $^{10}$B$_4$C layer for the neutron conversion. The detector was exposed to cold and ultracold neutrons (UCNs) at the J-PARC. Detection efficiencies were measured as (0.16$\pm$0.02)% and (12$\pm$2)% for cold and ultracold neutrons consistently with the $^{10}$B content in the converter. Positions of individual neutrons can be determined by observing secondary particle tracks recorded in the nuclear emulsion. The spatial resolution of incident neutrons were found to be in the range of 11-99 nm in the angle region of tan$胃\leq 1.9$, where $胃$ is the angle between a recorded track and the normal direction of the converter layer. The achieved spatial resolution corresponds to the improvement of one or two orders of magnitude compared with conventional techniques and it is comparable with the wavelength of UCNs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.00452v1-abstract-full').style.display = 'none'; document.getElementById('1803.00452v1-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 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.06351">arXiv:1712.06351</a> <span> [<a href="https://arxiv.org/pdf/1712.06351">pdf</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/10.7566/JPSCP.22.011033">10.7566/JPSCP.22.011033 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Fundamental physics activities with pulsed neutron at J-PARC(BL05) </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Awano%2C+S">Shogo Awano</a>, <a href="/search/physics?searchtype=author&query=Fuwa%2C+Y">Yasuhiro Fuwa</a>, <a href="/search/physics?searchtype=author&query=Goto%2C+F">Fumiya Goto</a>, <a href="/search/physics?searchtype=author&query=Haddock%2C+C+C">Christopher C. Haddock</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">Masahiro Hino</a>, <a href="/search/physics?searchtype=author&query=Hirose%2C+M">Masanori Hirose</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">Katsuya Hirota</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+S">Sei Ieki</a>, <a href="/search/physics?searchtype=author&query=Imajo%2C+S">Sohei Imajo</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">Takashi Ino</a>, <a href="/search/physics?searchtype=author&query=Iwashita%2C+Y">Yoshihisa Iwashita</a>, <a href="/search/physics?searchtype=author&query=Katayama%2C+R">Ryo Katayama</a>, <a href="/search/physics?searchtype=author&query=Kawahara%2C+H">Hiroaki Kawahara</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Kitahara%2C+R">Ryunosuke Kitahara</a>, <a href="/search/physics?searchtype=author&query=Koga%2C+J">Jun Koga</a>, <a href="/search/physics?searchtype=author&query=Morishita%2C+A">Aya Morishita</a>, <a href="/search/physics?searchtype=author&query=Nagae%2C+T">Tomofumi Nagae</a>, <a href="/search/physics?searchtype=author&query=Nagakura%2C+N">Naoki Nagakura</a>, <a href="/search/physics?searchtype=author&query=Naganawa%2C+N">Naotaka Naganawa</a>, <a href="/search/physics?searchtype=author&query=Oi%2C+N">Noriko Oi</a>, <a href="/search/physics?searchtype=author&query=Oide%2C+H">Hideyuki Oide</a>, <a href="/search/physics?searchtype=author&query=Otono%2C+H">Hidetoshi Otono</a>, <a href="/search/physics?searchtype=author&query=Seki%2C+Y">Yoshichika Seki</a> , et al. (15 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="1712.06351v2-abstract-short" style="display: inline;"> "Neutron Optics and Physics (NOP/ BL05)" at MLF in J-PARC is a beamline for studies of fundamental physics. The beamline is divided into three branches so that different experiments can be performed in parallel. These beam branches are being used to develop a variety of new projects. We are developing an experimental project to measure the neutron lifetime with total uncertainty of 1 s (0.1%). The… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.06351v2-abstract-full').style.display = 'inline'; document.getElementById('1712.06351v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.06351v2-abstract-full" style="display: none;"> "Neutron Optics and Physics (NOP/ BL05)" at MLF in J-PARC is a beamline for studies of fundamental physics. The beamline is divided into three branches so that different experiments can be performed in parallel. These beam branches are being used to develop a variety of new projects. We are developing an experimental project to measure the neutron lifetime with total uncertainty of 1 s (0.1%). The neutron lifetime is an important parameter in elementary particle and astrophysics. Thus far, the neutron lifetime has been measured by several groups; however, different values are obtained from different measurement methods. This experiment is using a method with different sources of systematic uncertainty than measurements conducted to date. We are also developing a source of pulsed ultra-cold neutrons (UCNs) produced from a Doppler shifter are available at the unpolarized beam branch. We are developing a time focusing device for UCNs, a so called "rebuncher", which can increase UCN density from a pulsed UCN source. At the low divergence beam branch, an experiment to search an unknown intermediate force with nanometer range is performed by measuring the angular dependence of neutron scattering by noble gases. Finally the beamline is also used for the research and development of optical elements and detectors. For example, a position sensitive neutron detector that uses emulsion to achieve sub-micrometer resolution is currently under development. We have succeeded in detecting cold and ultra-cold neutrons using the emulsion detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.06351v2-abstract-full').style.display = 'none'; document.getElementById('1712.06351v2-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 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">9 pages, 5 figures, Proceedings of International Conference on Neutron Optics (NOP2017)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.02984">arXiv:1712.02984</a> <span> [<a href="https://arxiv.org/pdf/1712.02984">pdf</a>, <a href="https://arxiv.org/format/1712.02984">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/10.1103/PhysRevD.97.062002">10.1103/PhysRevD.97.062002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Search for deviations from the inverse square law of gravity at nm range using a pulsed neutron beam </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=Oi%2C+N">Noriko Oi</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">Katsuya Hirota</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">Takashi Ino</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Matsumoto%2C+S">Satoru Matsumoto</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Shima%2C+T">Tatsushi Shima</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">W. Michael Snow</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="1712.02984v2-abstract-short" style="display: inline;"> We describe an experimental search for deviations from the inverse square law of gravity at the nanometer length scale using neutron scattering from noble gases on a pulsed slow neutron beamline. By measuring the neutron momentum transfer ($q$) dependence of the differential cross section for xenon and helium and comparing to their well-known analytical forms, we place an upper bound on the streng… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.02984v2-abstract-full').style.display = 'inline'; document.getElementById('1712.02984v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.02984v2-abstract-full" style="display: none;"> We describe an experimental search for deviations from the inverse square law of gravity at the nanometer length scale using neutron scattering from noble gases on a pulsed slow neutron beamline. By measuring the neutron momentum transfer ($q$) dependence of the differential cross section for xenon and helium and comparing to their well-known analytical forms, we place an upper bound on the strength of a new interaction as a function of interaction length $位$ which improves upon previous results in the region $位< 0.1\,$nm, and remains competitive in the larger $位$ region. A pseudoexperimental simulation developed for this experiment and its role in the data analysis described. We conclude with plans for improving sensitivity in the larger $位$ region. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.02984v2-abstract-full').style.display = 'none'; document.getElementById('1712.02984v2-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> 21 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">8 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 97, 062002 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.01831">arXiv:1712.01831</a> <span> [<a href="https://arxiv.org/pdf/1712.01831">pdf</a>, <a href="https://arxiv.org/format/1712.01831">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 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/10.7566/JPSCP.22.011036">10.7566/JPSCP.22.011036 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Precise Neutron Lifetime Measurement with a Solenoidal Coil </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sumi%2C+N">Naoyuki Sumi</a>, <a href="/search/physics?searchtype=author&query=Otono%2C+H">Hidetoshi Otono</a>, <a href="/search/physics?searchtype=author&query=Yoshioka%2C+T">Tamaki Yoshioka</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Makida%2C+Y">Yasuhiro Makida</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="1712.01831v2-abstract-short" style="display: inline;"> The neutron lifetime, $蟿$ = 880.2 $\pm$ 1.0 sec , is an important parameter for particle physics and cosmology. There is, however, an 8.4 sec (4.0$\,蟽$) deviation between the measured value of the neutron lifetime using two methods : one method counts neutrons that survive after some time, while the other counts protons resulting from neutron beta decay. A new method is being implemented at J-PARC… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.01831v2-abstract-full').style.display = 'inline'; document.getElementById('1712.01831v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.01831v2-abstract-full" style="display: none;"> The neutron lifetime, $蟿$ = 880.2 $\pm$ 1.0 sec , is an important parameter for particle physics and cosmology. There is, however, an 8.4 sec (4.0$\,蟽$) deviation between the measured value of the neutron lifetime using two methods : one method counts neutrons that survive after some time, while the other counts protons resulting from neutron beta decay. A new method is being implemented at J-PARC / MLF / BL05 using a pulsed cold neutron beam. A Time Projection Chamber (TPC) records both the electrons from neutron beta decay and protons from the neutron-$^3$He capture reactions in order to estimate the neutron flux. Electron background signals require the largest correction and are source of uncertainty for this experiment. A solenoidal magnetic field can greatly reduce this background. The TPC drift region must be divided into three region in this case. A prototype detector was developed to study the multi drift layer TPC. The status of a study using a prototype detector is reported in this paper. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.01831v2-abstract-full').style.display = 'none'; document.getElementById('1712.01831v2-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 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">4 pages, 5 figures, Proceedings of International Conference on Neutron Optics (NOP2017)</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> KYUSHU-RCAPP-2017-04 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.03099">arXiv:1702.03099</a> <span> [<a href="https://arxiv.org/pdf/1702.03099">pdf</a>, <a href="https://arxiv.org/format/1702.03099">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> <p class="title is-5 mathjax"> Precise neutron lifetime experiment using pulsed neutron beams at J-PARC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nagakura%2C+N">Naoki Nagakura</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">Katsuya Hirota</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+S">Sei Ieki</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">Takashi Ino</a>, <a href="/search/physics?searchtype=author&query=Iwashita%2C+Y">Yoshihisa Iwashita</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">Masaaki Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Kitahara%2C+R">Ryunosuke Kitahara</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">Kenji Mishima</a>, <a href="/search/physics?searchtype=author&query=Morishita%2C+A">Aya Morishita</a>, <a href="/search/physics?searchtype=author&query=Oide%2C+H">Hideyuki Oide</a>, <a href="/search/physics?searchtype=author&query=Otono%2C+H">Hidetoshi Otono</a>, <a href="/search/physics?searchtype=author&query=Sakakibara%2C+R">Risa Sakakibara</a>, <a href="/search/physics?searchtype=author&query=Seki%2C+Y">Yoshichika Seki</a>, <a href="/search/physics?searchtype=author&query=Shima%2C+T">Tatsushi Shima</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">Hirohiko M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Sugino%2C+T">Tomoaki Sugino</a>, <a href="/search/physics?searchtype=author&query=Sumi%2C+N">Naoyuki Sumi</a>, <a href="/search/physics?searchtype=author&query=Sumino%2C+H">Hiroshima Sumino</a>, <a href="/search/physics?searchtype=author&query=Taketani%2C+K">Kaoru Taketani</a>, <a href="/search/physics?searchtype=author&query=Tanaka%2C+G">Genki Tanaka</a>, <a href="/search/physics?searchtype=author&query=Tomita%2C+T">Tatsuhiko Tomita</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+T">Takahito Yamada</a>, <a href="/search/physics?searchtype=author&query=Yamashita%2C+S">Satoru Yamashita</a>, <a href="/search/physics?searchtype=author&query=Yokohashi%2C+M">Mami Yokohashi</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="1702.03099v1-abstract-short" style="display: inline;"> The neutron lifetime is one of the basic parameters in the weak interaction, and is used for predicting the light element abundance in the early universe. Our group developed a new setup to measure the lifetime with the goal precision of 0.1% at the polarized beam branch BL05 of MLF, J-PARC. The commissioning data was acquired in 2014 and 2015, and the first set of data to evaluate the lifetime in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.03099v1-abstract-full').style.display = 'inline'; document.getElementById('1702.03099v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.03099v1-abstract-full" style="display: none;"> The neutron lifetime is one of the basic parameters in the weak interaction, and is used for predicting the light element abundance in the early universe. Our group developed a new setup to measure the lifetime with the goal precision of 0.1% at the polarized beam branch BL05 of MLF, J-PARC. The commissioning data was acquired in 2014 and 2015, and the first set of data to evaluate the lifetime in 2016, which is expected to yield a statistical uncertainty of O(1)%. This paper presents the current analysis results and the future plans to achieve our goal precision. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.03099v1-abstract-full').style.display = 'none'; document.getElementById('1702.03099v1-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 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">8 pages, 7 figures, 2 tables, the 26th International Nuclear Physics Conference</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.04544">arXiv:1612.04544</a> <span> [<a href="https://arxiv.org/pdf/1612.04544">pdf</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"> A neutron detector with spatial resolution of submicron using fine-grained nuclear emulsion </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Naganawa%2C+N">N. Naganawa</a>, <a href="/search/physics?searchtype=author&query=Awano%2C+S">S. Awano</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">M. Hino</a>, <a href="/search/physics?searchtype=author&query=Hirose%2C+M">M. Hirose</a>, <a href="/search/physics?searchtype=author&query=Hirota%2C+K">K. Hirota</a>, <a href="/search/physics?searchtype=author&query=Kawahara%2C+H">H. Kawahara</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Nagae%2C+T">T. Nagae</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Tasaki%2C+S">S. Tasaki</a>, <a href="/search/physics?searchtype=author&query=Umemoto%2C+A">A. Umemoto</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="1612.04544v1-abstract-short" style="display: inline;"> We have been developing a neutron detector with spatial resolution of submicron by loading 6Li into fine-grained nuclear emulsion. By exposure to thermal neutrons, tracks from neutron capture events were observed. From their grain density, spatial resolution was estimated. Detection efficiency was also measured by an experiment with cold neutrons. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.04544v1-abstract-full" style="display: none;"> We have been developing a neutron detector with spatial resolution of submicron by loading 6Li into fine-grained nuclear emulsion. By exposure to thermal neutrons, tracks from neutron capture events were observed. From their grain density, spatial resolution was estimated. Detection efficiency was also measured by an experiment with cold neutrons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.04544v1-abstract-full').style.display = 'none'; document.getElementById('1612.04544v1-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 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">6 pages, 5 figures, proceedings of 8th International Topical Meeting on Neutron Radiography, ITMNR-8, 4-8 September 2016, Beijing, China. To be published by Physics Procedia</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1507.07223">arXiv:1507.07223</a> <span> [<a href="https://arxiv.org/pdf/1507.07223">pdf</a>, <a href="https://arxiv.org/ps/1507.07223">ps</a>, <a href="https://arxiv.org/format/1507.07223">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/ptv177">10.1093/ptep/ptv177 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Pulsed UCN production using a Doppler shifter at J-PARC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Imajo%2C+S">S. Imajo</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Iwashia%2C+Y">Y. Iwashia</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+N+L">N. L. Yamada</a>, <a href="/search/physics?searchtype=author&query=Hino%2C+M">M. Hino</a>, <a href="/search/physics?searchtype=author&query=Oda%2C+T">T. Oda</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">T. Ino</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+H+M">H. M. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Yamashita%2C+S">S. Yamashita</a>, <a href="/search/physics?searchtype=author&query=Katayama%2C+R">R. Katayama</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="1507.07223v3-abstract-short" style="display: inline;"> We have constructed a Doppler-shifter-type pulsed ultra-cold neutron (UCN) source at the Materials and Life Science Experiment Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). Very-cold neutrons (VCNs) with 136-$\mathrm{m/s}$ velocity in a neutron beam supplied by a pulsed neutron source are decelerated by reflection on a m=10 wide-band multilayer mirror, yielding pulsed U… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.07223v3-abstract-full').style.display = 'inline'; document.getElementById('1507.07223v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.07223v3-abstract-full" style="display: none;"> We have constructed a Doppler-shifter-type pulsed ultra-cold neutron (UCN) source at the Materials and Life Science Experiment Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). Very-cold neutrons (VCNs) with 136-$\mathrm{m/s}$ velocity in a neutron beam supplied by a pulsed neutron source are decelerated by reflection on a m=10 wide-band multilayer mirror, yielding pulsed UCN. The mirror is fixed to the tip of a 2,000-rpm rotating arm moving with 68-$\mathrm{m/s}$ velocity in the same direction as the VCN. The repetition frequency of the pulsed UCN is $8.33~\mathrm{Hz}$ and the time width of the pulse at production is $4.4~\mathrm{ms}$. In order to increase the UCN flux, a supermirror guide, wide-band monochromatic mirrors, focus guides, and a UCN extraction guide have been newly installed or improved. The $1~\mathrm{MW}$-equivalent count rate of the output neutrons with longitudinal wavelengths longer than $58~\mathrm{nm}$ is $1.6 \times 10^{2}~\mathrm{cps}$, while that of the true UCNs is $80~\mathrm{cps}$. The spatial density at production is $1.4~\mathrm{UCN/cm^{3}}$. This new UCN source enables us to research and develop apparatuses necessary for the investigation of the neutron electric dipole moment (nEDM). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.07223v3-abstract-full').style.display = 'none'; document.getElementById('1507.07223v3-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 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">32 pages, 15 fugures. A grammatical error was fixed</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1503.07936">arXiv:1503.07936</a> <span> [<a href="https://arxiv.org/pdf/1503.07936">pdf</a>, <a href="https://arxiv.org/ps/1503.07936">ps</a>, <a href="https://arxiv.org/format/1503.07936">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 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.2015.08.006">10.1016/j.nima.2015.08.006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development of time projection chamber for precise neutron lifetime measurement using pulsed cold neutron beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Arimoto%2C+Y">Y. Arimoto</a>, <a href="/search/physics?searchtype=author&query=Higashi%2C+N">N. Higashi</a>, <a href="/search/physics?searchtype=author&query=Igarashi%2C+Y">Y. Igarashi</a>, <a href="/search/physics?searchtype=author&query=Iwashita%2C+Y">Y. Iwashita</a>, <a href="/search/physics?searchtype=author&query=Ino%2C+T">T. Ino</a>, <a href="/search/physics?searchtype=author&query=Katayama%2C+R">R. Katayama</a>, <a href="/search/physics?searchtype=author&query=Kitahara%2C+R">R. Kitahara</a>, <a href="/search/physics?searchtype=author&query=Kitaguchi%2C+M">M. Kitaguchi</a>, <a href="/search/physics?searchtype=author&query=Matsumura%2C+H">H. Matsumura</a>, <a href="/search/physics?searchtype=author&query=Mishima%2C+K">K. Mishima</a>, <a href="/search/physics?searchtype=author&query=Oide%2C+H">H. Oide</a>, <a href="/search/physics?searchtype=author&query=Otono%2C+H">H. Otono</a>, <a href="/search/physics?searchtype=author&query=Sakakibara%2C+R">R. Sakakibara</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=Sugino%2C+T">T. Sugino</a>, <a href="/search/physics?searchtype=author&query=Sumi%2C+N">N. Sumi</a>, <a href="/search/physics?searchtype=author&query=Sumino%2C+H">H. Sumino</a>, <a href="/search/physics?searchtype=author&query=Taketani%2C+K">K. Taketani</a>, <a href="/search/physics?searchtype=author&query=Tanaka%2C+G">G. Tanaka</a>, <a href="/search/physics?searchtype=author&query=Tanaka%2C+M">M. Tanaka</a>, <a href="/search/physics?searchtype=author&query=Tauchi%2C+K">K. Tauchi</a>, <a href="/search/physics?searchtype=author&query=Toyoda%2C+A">A. Toyoda</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+T">T. Yamada</a>, <a href="/search/physics?searchtype=author&query=Yamashita%2C+S">S. Yamashita</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="1503.07936v2-abstract-short" style="display: inline;"> A new time projection chamber (TPC) was developed for neutron lifetime measurement using a pulsed cold neutron spallation source at the Japan Proton Accelerator Research Complex (J-PARC). Managing considerable background events from natural sources and the beam radioactivity is a challenging aspect of this measurement. To overcome this problem, the developed TPC has unprecedented features such as… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.07936v2-abstract-full').style.display = 'inline'; document.getElementById('1503.07936v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1503.07936v2-abstract-full" style="display: none;"> A new time projection chamber (TPC) was developed for neutron lifetime measurement using a pulsed cold neutron spallation source at the Japan Proton Accelerator Research Complex (J-PARC). Managing considerable background events from natural sources and the beam radioactivity is a challenging aspect of this measurement. To overcome this problem, the developed TPC has unprecedented features such as the use of polyether-ether-ketone plates in the support structure and internal surfaces covered with $^6$Li-enriched tiles to absorb outlier neutrons. In this paper, the design and performance of the new TPC are reported in detail. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.07936v2-abstract-full').style.display = 'none'; document.getElementById('1503.07936v2-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 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 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">33 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instrument sand Methods in Physics Research A, 799 (2015) 187 </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 href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 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