Theoretical analysis and predictions for the two-neutrino double electron capture of 124Xe

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F24%3A00381086" target="_blank" >RIV/68407700:21670/24:00381086 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1088/1361-6471/ad8767" target="_blank" >https://doi.org/10.1088/1361-6471/ad8767</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6471/ad8767" target="_blank" >10.1088/1361-6471/ad8767</a>

Result language

angličtina

Original language name

Theoretical analysis and predictions for the two-neutrino double electron capture of 124Xe

Original language description

We provide a complete theoretical description of the two-neutrino electron capture in 124 Xe, improving both the nuclear and the atomic structure calculations. We improve the general formalism through the use of the Taylor expansion method, leading to higher-order terms in the decay rate of the process. The nuclear part is treated with pn-QRPA and interacting shell model ( ISM ) methods. The nuclear matrix elements ( NMEs ) are calculated with the pn-QRPA method with isospin restoration by fi xing the input parameters so that the experimental decay rate is reproduced, resulting in values significantly lower than in previous calculations. The validity of the pn-QRPA NMEs is tested by showing their values to be comparable with the ones for double-beta decay with the emission of two antineutrinos of 128,130Te, which have similar pairing features. Within the ISM, we reproduce the total experimental half-life within a factor of two and predict the capture fraction to the KK channel of about 74%. We also predict the capture fractions to other decay channels and show that for the cumulative decay to the KL1-KO1 channels, a capture fraction of about 24% could be observed experimentally. On the atomic side, calculations are improved by accounting for the Pauli blocking of the decay of innermost nucleon states and by considering all s-wave electrons available for capture, expanding beyond the K and L1 orbitals considered in previous studies. We also provide improved atomic relaxation energies of the fi nal atomic states of Te-124, which may be used as input for background modeling in liquid Xenon experiments.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/EF16_019%2F0000766" target="_blank" >EF16_019/0000766: Engineering applications of microworld physics</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physics G: Nuclear and Particle Physics

ISSN

0954-3899

e-ISSN

1361-6471

Volume of the periodical

51

Issue of the periodical within the volume

12

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

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UT code for WoS article

001356313300001

EID of the result in the Scopus database

2-s2.0-85209732776