Shell Model description of the beta beta decay of 136Xe

Details Shell Model description of the beta beta decay of 136Xe Shell Model description of the beta beta decay of 136Xe

2011-12-21

arxiv.org/abs/1112.5039v2

Physics

Nuclear Physics

Nuclear Theory

Revised version accepted in Physics Letters B. Figure 3 replaced

Scientific paper

We study in this letter the double beta decay of 136Xe with emission of two neutrinos which has been recently measured by the EXO-200 collaboration. We use the same shell model framework, valence space, and effective interaction that we have already employed in our calculation of the nuclear matrix element (NME) of its neutrinoless double beta decay. Using the quenching factor of the Gamow-Teller operator which is needed to reproduce the very recent high resolution 136Xe (3He, t)136Cs data, we obtain a nuclear matrix element M(2nu)=0.025 MeV^(-1) compared with the experimental value M(2nu)=0.019(2) MeV^(-1).

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