Coupled-cluster calculations of neutrinoless double-beta decay in 48Ca
Abstract
We use coupled-cluster theory and nuclear interactions from chiral effective field theory to compute the nuclear matrix element for the neutrinoless double-beta decay of 48Ca. Benchmarks with the no-core shell model in several light nuclei inform us about the accuracy of our approach. For 48Ca we find a relatively small matrix element. We also compute the nuclear matrix element for the two-neutrino double-beta decay of 48Ca with a quenching factor deduced from two-body currents in recent ab-initio calculation of the Ikeda sum-rule in 48Ca [Gysbers et al., Nature Physics 15, 428-431 (2019)].
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