Large-scale shell-model analysis of the neutrinoless $\beta\beta$ decay of $^{48}$Ca
Nuclear Theory
2016-03-23 v1 High Energy Physics - Experiment
High Energy Physics - Phenomenology
Nuclear Experiment
Abstract
We present the nuclear matrix element for the neutrinoless double-beta decay of Ca based on large-scale shell-model calculations including two harmonic oscillator shells ( and shells). The excitation spectra of Ca and Ti, and the two-neutrino double-beta decay of Ca are reproduced in good agreement to experiment. We find that the neutrinoless double-beta decay nuclear matrix element is enhanced by about 30\% compared to -shell calculations. This reduces the decay lifetime by almost a factor of two. The matrix-element increase is mostly due to pairing correlations associated with cross-shell - excitations. We also investigate possible implications for heavier neutrinoless double-beta decay candidates.
Keywords
Cite
@article{arxiv.1602.07822,
title = {Large-scale shell-model analysis of the neutrinoless $\beta\beta$ decay of $^{48}$Ca},
author = {Y. Iwata and N. Shimizu and T. Otsuka and Y. Utsuno and J. Menendez and M. Honma and T. Abe},
journal= {arXiv preprint arXiv:1602.07822},
year = {2016}
}
Comments
Phys. Rev. Lett., accepted