期刊
PHYSICAL REVIEW LETTERS
卷 116, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.112502
关键词
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资金
- HPCI Strategic Program [hp150224]
- CNS-RIKEN joint project
- JSPS
- [23244049]
- [25870168]
- [2604323]
- [15H01029]
- Grants-in-Aid for Scientific Research [23244049, 14F04323, 25870168, 15K05094, 15H01029] Funding Source: KAKEN
We present the nuclear matrix element for the neutrinoless double-beta decay of Ca-48 based on large-scale shell-model calculations including two harmonic oscillator shells (sd and pf shells). The excitation spectra of Ca-48 and Ti-48, and the two-neutrino double-beta decay of Ca-48 are reproduced in good agreement to the experimental data. We find that the neutrinoless double-beta decay nuclear matrix element is enhanced by about 30% compared to pf-shell calculations. This reduces the decay lifetime by almost a factor of 2. The matrix-element increase is mostly due to pairing correlations associated with cross-shell sd-pf excitations. We also investigate possible implications for heavier neutrinoless double-beta decay candidates.
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