Two-neutrino double electron capture of $^{124}$Xe in the first LUX-ZEPLIN exposure
Year: 2024
Type: article
Abstract: The broad physics reach of the LUX-ZEPLIN (LZ) experiment covers rare phenomena beyond the direct detection of dark matter. We report precise measurements of the extremely rare decay of $^{124}$Xe through the process of two-neutrino double electron capture, utilizing a 1.39 kg × yr isotopic exposure from the first LZ science run. A half-life of T 1 / 2 2 ν 2 EC = ( 1.09 ± 0.1 4 stat ± 0.0 5 sys ) × 1 0 22 yr is observed with a statistical significance of 8.3σ, in agreement with literature. First empirical measurements of the KK capture fraction relative to other K-shell modes were conducted, and demonstrate consistency with respect to recent signal models at the 1.4σ level.
DOI: 10.5167/uzh-282343
Authors: Aalbers, J, Penning, B, Al Musalhi, A K, Alder, F, Amarasinghe, C S, Ames, A, Anderson, T J, Angelides, N, Araújo, H M, Armstrong, J E, Arthurs, M, Baker, A, Balashov, S, Bang, J, Bargemann, J W, Barillier, E E, Hernandez, M., Rischbieter, G R C, Biekert, A, Biesiadzinski, T P, Birch, H J, Bishop, E, Blockinger, G M, Boxer, B, Brew, C A J, Brás, P, Burdin, S, Buuck, M, Carmona-Benitez, M C, Carter, M, et al
Language: English
Topic: Neutrino Physics Research
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7124753959
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