Neutron lifetime measurement with pulsed cold neutrons,Progress of Theoretical and Experimental Physics

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Neutron lifetime measurement with pulsed cold neutrons
Progress of Theoretical and Experimental Physics ( IF 3.5 ) Pub Date : 2020-12-01 , DOI: 10.1093/ptep/ptaa169
K Hirota ₁ , G Ichikawa _{2,

3} , S Ieki ₄ , T Ino _{2,

3} , Y Iwashita ₅ , M Kitaguchi _{1,

6} , R Kitahara ₇ , J Koga ₈ , K Mishima _{2,

3} , T Mogi ₄ , K Morikawa ₁ , A Morishita ₈ , N Nagakura ₄ , H Oide ₄ , H Okabe ₁ , H Otono ₉ , Y Seki ₁₀ , D Sekiba ₁₁ , T Shima ₁₂ , H M Shimizu ₁ , N Sumi _{2,

3,

8} , H Sumino ₁₃ , T Tomita ₈ , H Uehara ₈ , T Yamada ₄ , S Yamashita ₁₄ , K Yano ₈ , M Yokohashi ₁ , T Yoshioka ₉

Affiliation

Department of Physics, Nagoya University, Nagoya, Japan
High Energy Accelerator Research Organization (KEK), Tsukuba, Japan
J-PARC Center, Tokai, Japan
Department of Physics, The University of Tokyo, Tokyo, Japan
Institute of Chemical Research, Kyoto University, Uji, Japan
Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University, Nagoya, Japan
Department of Physics, Kyoto University, Kyoto, Japan
Department of Physics, Graduate School of Science, Kyushu University, Fukuoka, Japan
Research Center for Advanced Particle Physics (RCAPP), Kyushu University, Fukuoka, Japan
Center for Physics and Mathematics, Osaka Electro-Communication University, Neyagawa, Japan
Institute of Applied Physics, University of Tsukuba, Tsukuba, Japan
Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Japan
Department of General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan
International Center for the Elementary Particle Physics (ICEPP), The University of Tokyo, Tokyo, Japan

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.

中文翻译：

用脉冲冷中子测量中子寿命

中子寿命是通过将衰减率与来自日本质子加速器研究中心 (J-PARC) 的散裂中子源的脉冲中子束的 $^3$He 核的反应速率进行比较来测量的。衰变速率和反应速率是通过同时检测来自中子衰变的电子和来自 $^3$He(n,p)$^3$H 反应的质子，使用工作气体含有稀释 $^3 的气室来确定的$他。测得的中子寿命为$898\,\pm\,10\,_{\rm stat}\,^{+15}_{-18}\,_{\rm sys}\,$s。

更新日期：2020-12-01

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