Impact of the leading-order short-range nuclear matrix element on the neutrinoless double-beta decay of medium-mass and heavy nuclei
We evaluate the leading-order short-range nuclear matrix element for the neutrinoless double-beta (0νββ) decay of the nuclei most relevant for experiments, including 76Ge, 100Mo, 130Te and 136Xe. In our calculations, performed with the nuclear shell model and proton-neutron quasiparticle random-phas...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Elsevier
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/d18b3fc1e08e48569c90ea8f2dcf99d1 |
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| Sumario: | We evaluate the leading-order short-range nuclear matrix element for the neutrinoless double-beta (0νββ) decay of the nuclei most relevant for experiments, including 76Ge, 100Mo, 130Te and 136Xe. In our calculations, performed with the nuclear shell model and proton-neutron quasiparticle random-phase approximation (pnQRPA) methods, we estimate the coupling of this term by the contact charge-independence-breaking coupling of various nuclear Hamiltonians. Our results suggest a significant impact of the short-range matrix element, which is about 15%−50% and 30%−80% of the standard 0νββ-decay long-range matrix element for the shell model and pnQRPA, respectively. Combining the full matrix elements with the results from current 0νββ-decay experiments we find that, if both matrix elements carry the same sign, these searches move notably toward probing the inverted mass ordering of neutrino masses. |
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