A free neutron decays in a lifetime of about 880 s. Although the neutron lifetime is an important parameter in modern physics, there is a 4.6σ (9.5 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.
|ジャーナル||Proceedings of Science|
|出版ステータス||Published - 2022 5月 24|
|イベント||22nd Particles and Nuclei International Conference, PANIC 2021 - Virtual, Online, Portugal|
継続期間: 2021 9月 5 → 2021 9月 10
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