用脉冲冷中子测量中子寿命

arXiv: High Energy Physics - Experiment Pub Date : 2020-07-22 DOI:10.1093/ptep/ptaa169

K. Hirota, G. Ichikawa, S. Ieki, T. Ino, Y. Iwashita, M. Kitaguchi, R. Kitahara, J. Koga, K. Mishima, T. Mogi, K. Morikawa, A. Morishita, N. Nagakura, H. Oide, H. Okabe, H. Otono, Y. Seki, D. Sekiba, T. Shima, H. Shimizu, N. Sumi, N. Sumi, H. Sumino, T. Tomita, H. Uehara, Tatsuhiro Yamada, S. Yamashita, K. Yano, M. Yokohashi, T. Yoshioka

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引用次数: 18

摘要

在日本质子加速器研究中心(J-PARC)，通过比较散裂中子源脉冲中子束的衰变速率和$^3$He核的反应速率，测量了中子寿命。衰变速率和反应速率是通过同时检测中子衰变产生的电子和$^3$He(n,p)$^3$H反应产生的质子来确定的，该反应使用的气体中含有稀释的$^3$He。测量中子寿命是898美元\ \ \下午,10 \ _ {\ rm stat} \, ^ {+ 15} _ {-18} \, _ {\ rm sys} \ $ s。

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Neutron lifetime measurement with pulsed cold neutrons

The neutron lifetime has been measured by comparing the decay rate with the reaction rate of $^3$He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan Proton Accelerator Research Complex (J-PARC). The decay rate and the reaction rate were determined by simultaneously detecting electrons from the neutron decay and protons from the $^3$He(n,p)$^3$H reaction using a gas chamber of which working gas contains diluted $^3$He. The measured neutron lifetime was $898\,\pm\,10\,_{\rm stat}\,^{+15}_{-18}\,_{\rm sys}\,$s.

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arXiv: High Energy Physics - Experiment

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