Two-neutrino double electron capture of 124Xe in the first LUX-ZEPLIN exposure

The LUX-ZEPLIN (LZ) Collaboration; Jelie Aalbers; A. K. Al Musalhi; Sam Eriksen; Henning  Flächer; Lukasz Kreczko; Alexandre  Lindote; Nathan J Pannifer; Chris J Wright; et al.

doi:10.1088/1361-6471/ad9039

Two-neutrino double electron capture of ¹²⁴Xe in the first LUX-ZEPLIN exposure

The LUX-ZEPLIN (LZ) Collaboration, Jelie Aalbers, A. K. Al Musalhi^*, Sam Eriksen, Henning Flächer, Lukasz Kreczko, Alexandre Lindote^*, Nathan J Pannifer, Chris J Wright, et al.

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

5 Citations (Scopus)

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 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 T^2ν2EC _1/2 = (1.09± 0.14_stat ± 0.05_sys ) × 10²² 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.

Original language	English
Article number	015103
Number of pages	14
Journal	Journal of Physics G: Nuclear and Particle Physics
Volume	52
Issue number	1
DOIs	https://doi.org/10.1088/1361-6471/ad9039
Publication status	Published - 6 Dec 2024

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title = "Two-neutrino double electron capture of 124Xe in the first LUX-ZEPLIN exposure",

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 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 T2ν2EC 1/2 = (1.09± 0.14stat ± 0.05sys ) × 10²² 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.",

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doi = "10.1088/1361-6471/ad9039",

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T1 - Two-neutrino double electron capture of 124Xe in the first LUX-ZEPLIN exposure

AU - The LUX-ZEPLIN (LZ) Collaboration

AU - Aalbers, Jelie

AU - Musalhi, A. K. Al

AU - Eriksen, Sam

AU - Flächer, Henning

AU - Kreczko, Lukasz

AU - Lindote, Alexandre

AU - Pannifer, Nathan J

AU - Wright, Chris J

AU - al., et

PY - 2024/12/6

Y1 - 2024/12/6

N2 - 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 T2ν2EC 1/2 = (1.09± 0.14stat ± 0.05sys ) × 10²² 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.

AB - 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 T2ν2EC 1/2 = (1.09± 0.14stat ± 0.05sys ) × 10²² 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.

U2 - 10.1088/1361-6471/ad9039

DO - 10.1088/1361-6471/ad9039

M3 - Article (Academic Journal)

SN - 0954-3899

VL - 52

JO - Journal of Physics G: Nuclear and Particle Physics

JF - Journal of Physics G: Nuclear and Particle Physics

IS - 1

M1 - 015103

ER -