Neutrinoless double-β decay in the nucleon-pair shell model

作者:Xue, H. T.; Zhou, X. R.; Zhang, S. Y.; He, B. C.*; Luo, Y. A.; Li, L.; Pan, F.; Draayer, J. P.
来源:Physical Review C - Nuclear Physics, 2022, 105(1): 014304.
DOI:10.1103/PhysRevC.105.014304

摘要

Nuclear matrix elements (NMEs) of neutrinoless double-beta decay (0 nu beta beta) from 0(1)(+) to 0(1)(+) of Te-130 -> Xe-1(30), Xe-134 -> Ba-134, and Xe-136 -> Ba-136 are calculated in the nucleon pair shell-model framework. It is found that the NMEs of 0 nu beta beta calculated in the surface-delta approximation (SDI) and the BCS approximation with the model space truncated into the SD-pair subspace are close to each other and smaller than those predicted by the other models. The inclusion of the G pair does not alter the results significantly. When the single-particle energies are assumed to be degenerate, the calculated results in the SD-pair shell model become close to those of the other models. It is also shown that the NMEs are sensitive to the model parameters.

  • 单位
    南开大学