arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.04071physics.ins-detnucl-ex
收藏

在TRIUMF产生的第一个超冷中子

First ultracold neutrons produced at TRIUMF

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

摘要:

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 $T^7$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑