MOON for neutrino-less ββ decays and ββ nuclear matrix elements

Computer Science

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Double Beta Decay, Exchange Interactions (Electron), Proton-Nucleon Interactions, Weak-Interaction And Lepton Aspects, Transfer Reactions, Nucleon-Nucleon Interactions

Scientific paper

The MOON project aims at spectroscopic 0vββ studies with the v-mass sensitivity of 100-30 meV by measuring two beta rays from 100Mo and/or 82Se. The detector is a compact super-module of multi-layer PL scintillator plates. R&D works made by the pro to-type MOON-1 and the small PL plate show the possible energy resolution of around σ~2.2%, as required for the mass sensitivity. Nuclear matrix elements M2v for 2vββ are shown to be given by the sum ΣLMk of the 2vββ matrix elements Mk through intermediate quasi-particle states in the Fermi-surface, where Mi is obtained experimentally by using the GT(Jπ = 1+) matrix elements of Mi(k) and Mf(k) for the successive single-β transitions through the k-th intermediate state.

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