Ab initio IM-NCCI calculations on 48Ca establish linear correlations between 0νββ and 2νββ NMEs from 34 chiral Hamiltonians, constraining M^{0ν} to 1.30-1.65 using experimental 2ν data after applying a fitted quenching factor.
Anatomy of nuclear matrix elements for neutrinoless double-beta decay
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abstract
We show that, within the Quasiparticle Random Phase Approximation (QRPA) and the renormalized QRPA (RQRPA) based on the Bonn CD nucleon-nucleon interaction, the competition between the pairing and the neutron-proton particle-particle and particle-hole interactions causes contributions to the neutrinoless double-beta decay matrix element to nearly vanish at internucleon distances of more than 2 or 3 fermis. As a result, the matrix element is more sensitive to short-range/high-momentum physics than one naively expects. We analyze various ways of treating that physics and quantify the uncertainty it produces in the matrix elements, with three different treatments of short-range correlations.
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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 linear correlations between 0νββ and 2νββ NMEs from 34 chiral Hamiltonians, constraining M^{0ν} to 1.30-1.65 using experimental 2ν data after applying a fitted quenching factor.