The neutron lifetime is one of the important parameters for particle physics and astrophysics. There is a 4.6σ (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 ± 10(stat.) + 15/−18(syst.) s. We have performed improvements to reduce systematic uncertainties towards 1 s accuracy. The methods to measure the amount of 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.
|Journal||Proceedings of Science|
|Publication status||Published - May 24 2022|
|Event||22nd Particles and Nuclei International Conference, PANIC 2021 - Virtual, Online, Portugal|
Duration: Sep 5 2021 → Sep 10 2021
All Science Journal Classification (ASJC) codes