Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Tests of symmetries and conservation laws
Neutron lifetime experiment with pulsed cold neutrons at J-PARC
G. Ichikawa*, Y. Fuwa, T. Hasegawa, M. Hino, K. Hirota, T. Ino, Y. Iwashita, M. Kitaguchi, J. Koga, S. Matsuzaki, K. Mishima, T. Mogi, K. Morikawa, H. Okabe, H. Otono, Y. Seki, D. Sekiba, T. Shima, H. Shimizu, H.M. Shimizu, N. Sumi, H. Sumino, S. Yamashita, K. Yano and T. Yoshioka
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Pre-published on: March 02, 2022
Published on:
Abstract
A free neutron decays in a lifetime of about $880\,\mathrm{s}$.
Although the neutron lifetime is an important parameter in modern physics,
there is a $4.6\sigma$ ($9.5\,\mathrm{s}$) discrepancy between the experimental results
of two typical methods: the beam method and the storage method.
We are carrying out a new experimental method to measure the neutron lifetime
using a pulsed neutron beam at J-PARC MLF BL05
to determine the cause of the discrepancy,
whether overlooked systematic uncertainties or new physics.
A review of our experiment including the first physics result
with acquired data during 2014 - 2016 and
the status using new neutron optics are presented here.
DOI: https://doi.org/10.22323/1.380.0457
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