S. Ahmed, E. Altiere, T. Andalib, B. Bell, C. P. Bidinosti, E. Cudmore, M. Das, C. A. Davis, B. Franke, M. Gericke, P. Giampa, P. Gnyp, S. Hansen-Romu, K. Hatan… 展开作者
S. Ahmed, E. Altiere, T. Andalib, B. Bell, C. P. Bidinosti, E. Cudmore, M. Das, C. A. Davis, B. Franke, M. Gericke, P. Giampa, P. Gnyp, S. Hansen-Romu, K. Hatanaka, T. Hayamizu, B. Jamieson, D. Jones, S. Kawasaki, T. Kikawa, M. Kitaguchi, W. Klassen, A. Konaka, E. Korkmaz, F. Kuchler, M. Lang, L. Lee, T. Lindner, K. W. Madison, Y. Makida, J. Mammei, R. Mammei, J. W. Martin, R. Matsumiya, E. Miller, K. Mishima, T. Momose, T. Okamura, S. Page, R. Picker, E. Pierre, W. D. Ramsay, L. Rebenitsch, F. Rehm, W. Schreyer, H. M. Shimizu, S. Sidhu, A. Sikora, J. Smith, I. Tanihata, B. Thorsteinson, S. Vanbergen, W. T. H. van Oers, Y. X. Watanabe
我们在TRIUMF的一个新的专用溅射靶上安装了一个超冷中子源。该源最初是在日本开发的,使用冷却到0.9 $\,$ K的超流氦转换器。在2017年11月的一次广泛的测试活动中,我们在对目标进行一分钟照射后提取了多达325000个超冷中子,比以前使用该源实现的中子多三倍。在整个生产和指导体积中相应的超冷中子密度为5.3 $\,$ cm $^{-3}$。超冷中子在源中的贮存寿命最初为37 $\,$ s,在18天的运行期间下降到24 $\,$ s。在连续照射的溅射靶,我们能够检测到一个持续的超冷中子速率高达1500 $\,$ s $^{-1}$。模拟的UCN生产,UCN输运,温度依赖的UCN产率,和温度依赖的存储寿命显示出良好的协议与实验数据,并确认超冷中子上散射率在超流氦是成正比的$T^7$。
英文摘要:
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 $T^7$.
Initial results of the TRIUMF ultracold advanced neutron source
University of Manitoba(曼尼托巴大学);TRIUMF(特柳姆弗国家粒子加速器中心);Instituto de Física, Universidad Nacional Autónoma de México(墨西哥国立自治大学物理研究所);University of Saskatchewan(萨斯喀彻温大学);Simon Fraser University(西蒙菲莎大学);The University of Winnipeg(温尼伯大学);The University of British Columbia(不列颠哥伦比亚大学);Department of Nuclear Engineering, Kyoto University(京都大学核工系);Institute for Integrated Radiation and Nuclear Science (KURNS), Kyoto University(京都大学综合辐射与核科学研究所);North Carolina State University(北卡罗来纳州立大学);Research Center for Nuclear Physics (RCNP), The University of Osaka(大阪大学核物理研究中心)
Neutron EDM Experiment with an Advanced Ultracold Neutron Source at TRIUMF
Kyoto University(京都大学);Research Center for Nuclear Physics, the University of Osaka(大阪大学核物理研究中心);The University of Manitoba(曼尼托巴大学);TRIUMF(特利昂姆夫国家粒子加速器中心);Instituto de Física, Universidad Nacional Autónoma de México(墨西哥国立自治大学物理研究所);The University of Saskatchewan(萨斯喀彻温大学);Simon Fraser University(西蒙菲莎大学);The University of Winnipeg(温尼伯大学)
A New High-Intensity Source for Ultracold Neutrons
Nagoya University(名古屋大学);University of Manitoba(曼尼托巴大学);TRIUMF(特里姆夫实验室);Instituto de Física, Universidad Nacional Autónoma de México(墨西哥国立自治大学物理研究所);University of Saskatchewan(萨斯喀彻温大学);Simon Fraser University(西蒙菲莎大学);The University of Winnipeg(温尼伯大学);The University of British Columbia(不列颠哥伦比亚大学);Department of Nuclear Engineering, Kyoto University(京都大学核工学科);Institute for Integrated Radiation and Nuclear Science (KURNS), Kyoto University(京都大学综合辐射与核科学研究所(KURNS));North Carolina State University(北卡罗来纳州立大学)
Detection of ultracold neutrons with powdered scintillator screens
Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室);North Carolina State University(北卡罗来纳州立大学);Tennessee Technological University(田纳西理工大学);University of Illinois(伊利诺伊大学);East Tennessee State University(东田纳西州立大学);New Mexico State University(新墨西哥州立大学)
Performance of the TUCAN Magnetically Shielded Room
The University of Winnipeg(温尼伯大学);University of Manitoba(曼尼托巴大学);TRIUMF(特里姆夫实验室);Instituto de Física, Universidad Nacional Autónoma de México(墨西哥国立自治大学物理研究所);The University of British Columbia(不列颠哥伦比亚大学);Magnetic Shields Limited(磁屏蔽有限公司);Department of Physics, Technical University Munich(慕尼黑工业大学物理系);Department of Nuclear Engineering, Kyoto University(京都大学核工程系的);Institute for Integrated Radiation and Nuclear Science (KURNS), Kyoto University(京都大学综合辐射与核科学研究所)
本文研究了TUCAN磁屏蔽室在测量中子电偶极矩精度达10^-27 e cm的性能,通过测量得出屏蔽因子和残余磁场参数,为后续实验提供基础数据。
Ultracold Neutron Guide-Coating Facility at U.Winnipeg
Physikalisches Institut, Universität Heidelberg(海德堡大学物理研究所);Institut Laue Langevin(朗之万研究所);Department of Physics, University of Winnipeg(温尼伯大学物理系);Department of Physics and Astronomy, University of Manitoba(曼尼托巴大学物理与天文学系);TRIUMF(特里厄姆夫实验室);Instituto de Física, Universidad Nacional Autónoma d(国立自治大学生物物理研究所)