Nuclear matrix element for two neutrino double beta decay from 136Xe

Details Nuclear matrix element for two neutrino double beta decay from 136Xe Nuclear matrix element for two neutrino double beta decay from 136Xe

2012-03-06

arxiv.org/abs/1203.1103v1

Journal of the Physical Society Of Japan 81 (2012) 033201

Physics

Nuclear Physics

Nuclear Experiment

7 pages 6 figures

Scientific paper

10.1143/JPSJ.81.033201

The nuclear matrix element for the two neutrino double beta decay (DBD) of 136Xe was evaluated by FSQP (Fermi Surface Quasi Particle model), where experimental GT strengths measured by the charge exchange reaction and those by the beta decay rates were used. The 2 neutrino DBD matrix element is given by the sum of products of the single beta matrix elements via low-lying (Fermi Surface) quasi-particle states in the intermediate nucleus. 136Xe is the semi-magic nucleus with the closed neutron-shell, and the beta + transitions are almost blocked. Thus the 2 neutrino DBD is much suppressed. The evaluated 2 neutrino DBD matrix element is consistent with the observed value.

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