Development of measurement system of neutron beta decay

摘要

Precise measurement of neutron beta decay allows determining the coupling constant of weak interaction independent of any nuclear structure. We have developed measurement system of neutron beta decay at a thermal neutron beamline in JRR-3, JAEA. By using coincidence technique of two kinds of detectors, we have succeeded in detecting the signal of neutron beta decay with S/N of 0.63 aud count rate of 0.40cps. (c) 2006 Elsevier B.V. All rights reserved.