SMMC method for two-neutrino double beta decay
Abstract
Shell Model Monte Carlo (SMMC) techniques are used to calculate two-neutrino double beta decay matrix elements. We validate the approach against direct diagonalization for 48Ca in the complete pf-shell using the KB3 interaction. The method is then applied to the decay of 76Ge in the (0f5/2,1p,0g9/2) model space using a newly calculated realistic interaction. Our result for the matrix element is 0.130.05 MeV-1, in agreement with the experimental value.
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