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2019-08-23

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cc-by (c) E.A. Coello Pérez et al., 2019
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/215201

Two-neutrino double electron capture on 124Xe based on an effective theory and the nuclear shell model

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https://doi.org/10.1016/j.physletb.2019.134885

Abstract

We study the two-neutrino double electron capture on 124Xe based on an effective theory (ET) and large-scale shell model calculations, two modern nuclear structure approaches that have been tested against Gamow-Teller and double-beta decay data. In the ET, the low-energy constants are fit to electron capture and transitions around xenon. For the nuclear shell model, we use an interaction in a large configuration space that reproduces the spectroscopy of nuclei in this mass region. For the dominant transition to the 124Te ground state, we find half-lives y for the ET and y for the shell model. The ET uncertainty leads to a half-life almost entirely consistent with present experimental limits and largely within the reach of ongoing experiments. The shell model half-life range overlaps with the ET, but extends less beyond current limits. Our findings thus suggest that the two-neutrino double electron capture on 124Xe has a good chance to be discovered by ongoing or future experiments. In addition, we present results for the two-neutrino double electron capture to excited states of 124Te.

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Física de partícules, Neutrins, Estructura nuclear

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Particle physics, Neutrinos, Nuclear structure

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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COELLO PÉREZ, E.A., MENÉNDEZ SÁNCHEZ, Javier and SCHWENK, A. Two-neutrino double electron capture on 124Xe based on an effective theory and the nuclear shell model. Physics Letters B. 2019. Vol. 797, num. 134885. ISSN 0370-2693. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/215201

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