| Title: |
Two-neutrino double electron capture of 124 Xe in the first LUX-ZEPLIN exposure |
| Authors: |
Aalbers, J; Akerib, DS; Al Musalhi, AK; Alder, F; Amarasinghe, CS; Ames, A; Anderson, TJ; Angelides, N; Araújo, HM; Armstrong, JE; Arthurs, M; Baker, A; Balashov, S; Bang, J; Bargemann, JW; Barillier, EE; Beattie, K; Bhatti, A; Biekert, A; Biesiadzinski, TP; Birch, HJ; Bishop, E; Blockinger, GM; Boxer, B; Dey, S; Fearon, NM; Fieldhouse, N; Green, J; Hunt, D; Kraus, H; Palladino, KJ |
| Publisher Information: |
IOP Publishing |
| Publication Year: |
2025 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
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 124Xe 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 T1/22ν2EC=(1.09±0.14stat±0.05sys)×1022yr 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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1088/1361-6471/ad9039 |
| Availability: |
https://doi.org/10.1088/1361-6471/ad9039; https://ora.ox.ac.uk/objects/uuid:30e074bd-fd17-4004-a874-d5cac1085128 |
| Rights: |
info:eu-repo/semantics/openAccess ; CC Attribution (CC BY) |
| Accession Number: |
edsbas.72440C1A |
| Database: |
BASE |