Impact of the leading-order short-range nuclear matrix element on the neutrinoless double-beta decay of medium-mass and heavy nuclei

Physics Letters B

Pablo Soriano¹  Lotta Jokiniemi²  Javier Menéndez² 

[1] Departament de Física Quàntica i Astrofísica and Institut de Ciències del Cosmos, Universitat de Barcelona, 08028 Barcelona, Spain;Corresponding authors.;

关键词: Neutrinoless double-beta decay;    Nuclear matrix elements;    Quasiparticle random-phase approximation;    Nuclear shell model;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown