Two-neutrino double electron capture of <sup>124</sup>Xe in the first LUX-ZEPLIN exposure
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.
Authors
- J E Armstrong
- F Alder
- M Buuck
- T P Biesiadzinski
- et al.
- M C Carmona-Benitez
- S Burdin
- C A J Brew
- A Ames
- M. Hernandez
- E Bishop
- M Arthurs
- A Baker
- E E Barillier
- B Boxer
- A Biekert
- H. J. Birch
- B Penning
- G R C Rischbieter
- J W Bargemann
- G M Blockinger
- A K Al Musalhi
- S Balashov
- J. Aalbers
- N Angelides
- H M Araújo
- M Carter
- C S Amarasinghe
- P Brás
- J Bang
- T J Anderson
Publication Details
- Journal
- Universität Zürich, ZORA
- Published
- 2024-12-06
- DOI
- https://doi.org/10.5167/uzh-282343
- Primary Topic
- Neutrino Physics Research
- Type
- article
- Field-Weighted Citation Impact
- 0.00