PoS - Proceedings of Science
Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Tests of symmetries and conservation laws
Improvement of systematic uncertainties for the neutron lifetime experiment at J-PARC
T. Mogi*, T. Hasegawa, K. Hirota, G. Ichikawa, S. Ieki, T. Ino, Y. Iwashita, S. Kajiwara, Y. Kato, M. Kitaguchi, R. Kitahara, J. Koga, S. Makise, S. Matsuzaki, K. Mishima, K. Morikawa, N. Nagakura, H. Okabe, H. Otono, Y. Seki, D. Sekiba, T. Shima, H. Shimizu, H.M. Shimizu, Y. Sugisawa, N. Sumi, H. Sumino, T. Tanabe, T. Tomita, H. Uehara, T. Yamada, S. Yamashita, K. Yano and T. Yoshiokaet al. (click to show)
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Pre-published on: March 02, 2022
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Abstract
The neutron lifetime is one of the important parameters for particle physics and astrophysics. There is a 4.6$\sigma$ (9.5 s) discrepancy between the results of the two typical methods. To solve this discrepancy, a new neutron lifetime experiment with a different method is in progress at J-PARC, and this experiment published the first result in 2020 of $898 \pm 10 (\mathrm{stat.}) +15/-18 (\mathrm{syst.})\,\mathrm{s}$. We have performed improvements to reduce systematic uncertainties towards 1 s accuracy. The methods to measure the amount of $\mathrm{^3He}$ injected and in the working gas have been upgraded, and a new model for the space charge effect in the Monte Carlo simulation has been implemented.
DOI: https://doi.org/10.22323/1.380.0458
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