Ab initio IM-NCCI calculations on 48Ca establish strong linear correlations between 0νββ and 2νββ NMEs across 34 chiral Hamiltonians, yielding a constrained M^{0ν} prediction of 1.30-1.65 after incorporating experimental 2νββ data and an effective quenching factor.
Ingredients of nuclear matrix element for two-neutrino double-beta decay of 48Ca
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abstract
Large-scale shell model calculations including two major shells are carried out, and the ingredients of nuclear matrix element for two-neutrino double beta decay are investigated. Based on the comparison between the shell model calculations accounting only for one major shell ($pf$-shell) and those for two major shells ($sdpf$-shell), the effect due to the excitation across the two major shells is quantitatively evaluated.
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Ab initio correlations between neutrinoless and two-neutrino double-beta decays in $^{48}$Ca
Ab initio IM-NCCI calculations on 48Ca establish strong linear correlations between 0νββ and 2νββ NMEs across 34 chiral Hamiltonians, yielding a constrained M^{0ν} prediction of 1.30-1.65 after incorporating experimental 2νββ data and an effective quenching factor.