Journal
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
Volume 2020, Issue 12, Pages -Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/ptep/ptaa169
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [19GS0210, 23244047, 24654058, 26247035, 16H02194, 19H00690]
- Materials and Life Science Experimental Facility of the J-PARC [2012A0075, 2012B0219, 2014A0244, 2014B0271, 2015A0316]
- S-type project of KEK [2014S03, 2019S03]
- Grants-in-Aid for Scientific Research [19H00690, 24654058, 16H02194, 26247035, 23244047] Funding Source: KAKEN
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The neutron lifetime was measured by comparing the decay rate with the reaction rate of He-3 nuclei in a pulsed neutron beam from J-PARC, with the measured neutron lifetime being 898 +/- 10(stat) (+15)(-18)(sys) seconds.
The neutron lifetime has been measured by comparing the decay rate with the reaction rate of He-3 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 He-3(n, p)H-3 reaction using a gas chamber, the working gas of which contains diluted He-3. The measured neutron lifetime was 898 +/- 10(stat) (+15)(-18)(sys) S.
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