Coupled-Cluster Calculations of Neutrinoless Double-β Decay in ^{48}Ca

S Novario; P Gysbers; J Engel; G Hagen; G R Jansen; T D Morris; P Navrátil; T Papenbrock; S Quaglioni

doi:10.1103/PhysRevLett.126.182502

Coupled-Cluster Calculations of Neutrinoless Double-β Decay in ^{48}Ca

Phys Rev Lett. 2021 May 7;126(18):182502. doi: 10.1103/PhysRevLett.126.182502.

Authors

S Novario^{1

2}, P Gysbers^{3

4}, J Engel⁵, G Hagen^{1

2

3}, G R Jansen^{2

6}, T D Morris², P Navrátil³, T Papenbrock^{1

2}, S Quaglioni⁷

Affiliations

¹ Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
² Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
³ TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
⁴ Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
⁵ Department of Physics, University of North Carolina, Chapel Hill, North Carolina 27514, USA.
⁶ National Center for Computational Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
⁷ Lawrence Livermore National Laboratory, P.O. Box 808, L-414, Livermore, California 94551, USA.

PMID: 34018796
DOI: 10.1103/PhysRevLett.126.182502

Abstract

We use coupled-cluster theory and nuclear interactions from chiral effective field theory to compute the nuclear matrix element for the neutrinoless double-β decay of ^{48}Ca. Benchmarks with the no-core shell model in several light nuclei inform us about the accuracy of our approach. For ^{48}Ca we find a relatively small matrix element. We also compute the nuclear matrix element for the two-neutrino double-β decay of ^{48}Ca with a quenching factor deduced from two-body currents in recent ab initio calculation of the Ikeda sum rule in ^{48}Ca [Gysbers et al., Nat. Phys. 15, 428 (2019)NPAHAX1745-247310.1038/s41567-019-0450-7].