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

Coello Pérez, E. A., Menéndez, J., & Schwenk, A. (2019). Two-neutrino double electron capture on 124Xe based on an effective theory and the nuclear shell model. Physics Letters B, 797: 134885. doi:10.1016/j.physletb.2019.134885.

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Genre: Journal Article

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Creators:
Coello Pérez, E. A. , Author
Menéndez, J., Author
Schwenk, A.1, Author
Affiliations:
1Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society, ou_904548

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Free keywords: Nuclear Theory, nucl-th,Nuclear Experiment, nucl-ex
MPINP: Starke Wechselwirkung und exotische Kerne – Abteilung Blaum
Abstract: We study the two-neutrino double electron capture on $^{124}$Xe 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 $\beta^{-}$ 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 $^{124}$Te ground state, we find half-lives $T^{2\nu{\rm ECEC}}_{1/2}=(1.3-18)\times 10^{22}$ y for the ET and $T^{2\nu{\rm ECEC}}_{1/2} = (0.43-2.9)\times 10^{22}$ 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 $^{124}$Xe 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 $^{124}$Te.

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Dates: 2019-10-10
Publication Status: Published online
Pages: 5 pages, 2 figures
Publishing info: -
Rev. Method: -
Identifiers: arXiv: 1809.04443
DOI: 10.1016/j.physletb.2019.134885
URI: http://arxiv.org/abs/1809.04443
Degree: -

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### Source 1

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Title: Physics Letters B
Source Genre: Journal
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Publ. Info: North-Holland
Pages: - Volume / Issue: 797 Sequence Number: 134885 Start / End Page: - Identifier: ISSN: 0370-2693
CoNE: https://pure.mpg.de/cone/journals/resource/954925524777