Nuclear Matrix Element for Two Neutrino Double Beta Decay from 136Xe
Abstract
The nuclear matrix element for the two neutrino double beta decay (2ν β β) of 136Xe → 136Ba was evaluated by fermi surface quasi particle model (FSQP), where experimental GT strengths measured by the charge exchange reaction and those by the β decay rates were used. The 2ν β β matrix element is given by the sum of products of the single β- and β+ 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 β+ (proton → neutron) transitions are almost blocked. Thus the 2ν β β is much suppressed. The evaluated 2ν β β matrix element is consistent with the observed value.
- Publication:
-
Journal of the Physical Society of Japan
- Pub Date:
- March 2012
- DOI:
- 10.1143/JPSJ.81.033201
- arXiv:
- arXiv:1203.1103
- Bibcode:
- 2012JPSJ...81c3201E
- Keywords:
-
- Nuclear Experiment;
- Nuclear Theory
- E-Print:
- 7 pages 6 figures