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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/215187
Impact of the leading-order short-range nuclear matrix element on the neutrinoless double-beta decay of medium-mass and heavy nuclei
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We evaluate the leading-order short-range nuclear matrix element for the neutrinoless double-beta () 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 and of the standard -decay long-range matrix element for the shell model and pnQRPA, respectively. Combining the full matrix elements with the results from current -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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JOKINIEMI, Lotta, SORIANO, Pablo and MENÉNDEZ SÁNCHEZ, Javier. 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. 2021. Vol. 823, num. 136720. ISSN 0370-2693. [consulted: 8 of June of 2026]. Available at: https://hdl.handle.net/2445/215187