Nuclear Matrix Element for Two Neutrino Double Beta Decay from 136Xe

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概要

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• The nuclear matrix element for the two neutrino double beta decay (2\nu \beta \beta) of 136Xe \rightarrow 136Ba was evaluated by fermi surface quasi particle model (FSQP), where experimental GT strengths measured by the charge exchange reaction and those by the \beta decay rates were used. The 2\nu \beta \beta matrix element is given by the sum of products of the single \beta^{-} and \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^{+} (proton \rightarrow neutron) transitions are almost blocked. Thus the 2\nu \beta \beta is much suppressed. The evaluated 2\nu \beta \beta matrix element is consistent with the observed value.

• 2012-03-15

著者

• EJIRI Hiroyasu

  Research Center for Nuclear Physics (RCNP), Osaka University

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