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

The LZ collaboration

doi:10.1088/1361-6471/ad9039

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

The LZ collaboration

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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 T₁²_/ⁿ₂^2EC = (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 (US)
Article number	015103
Journal	Journal of Physics G: Nuclear and Particle Physics
Volume	52
Issue number	1
DOIs	https://doi.org/10.1088/1361-6471/ad9039
State	Published - Jan 31 2025

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1088/1361-6471/ad9039

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@article{2208a5eb2058476d9d0ee8a4b2580047,

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 T12/n22EC = (1.09 ± 0.14 stat ± 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.",

author = "\{The LZ collaboration\} and J. Aalbers and Akerib, \{D. S.\} and \{Al Musalhi\}, \{A. K.\} and F. Alder and Amarasinghe, \{C. S.\} and A. Ames and Anderson, \{T. J.\} and N. Angelides and Ara{\'u}jo, \{H. M.\} and Armstrong, \{J. E.\} and M. Arthurs and A. Baker and S. Balashov and J. Bang and Bargemann, \{J. W.\} and Barillier, \{E. E.\} and K. Beattie and A. Bhatti and A. Biekert and Biesiadzinski, \{T. P.\} and Birch, \{H. J.\} and E. Bishop and Blockinger, \{G. M.\} and B. Boxer and Brew, \{C. A.J.\} and P. Br{\'a}s and S. Burdin and M. Buuck and Carmona-Benitez, \{M. C.\} and M. Carter and A. Chawla and H. Chen and Chin, \{Y. T.\} and Chott, \{N. I.\} and Converse, \{M. V.\} and R. Coronel and A. Cottle and G. Cox and D. Curran and Dahl, \{C. E.\} and A. David and J. Delgaudio and S. Dey and \{de Viveiros\}, L. and \{Di Felice\}, L. and C. Ding and Dobson, \{J. E.Y.\} and E. Druszkiewicz and S. Dubey and Eriksen, \{S. R.\}",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s).",

year = "2025",

month = jan,

day = "31",

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

language = "English (US)",

volume = "52",

journal = "Journal of Physics G: Nuclear and Particle Physics",

issn = "0954-3899",

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TY - JOUR

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

AU - The LZ collaboration

AU - Aalbers, J.

AU - Akerib, D. S.

AU - Al Musalhi, A. K.

AU - Alder, F.

AU - Amarasinghe, C. S.

AU - Ames, A.

AU - Anderson, T. J.

AU - Angelides, N.

AU - Araújo, H. M.

AU - Armstrong, J. E.

AU - Arthurs, M.

AU - Baker, A.

AU - Balashov, S.

AU - Bang, J.

AU - Bargemann, J. W.

AU - Barillier, E. E.

AU - Beattie, K.

AU - Bhatti, A.

AU - Biekert, A.

AU - Biesiadzinski, T. P.

AU - Birch, H. J.

AU - Bishop, E.

AU - Blockinger, G. M.

AU - Boxer, B.

AU - Brew, C. A.J.

AU - Brás, P.

AU - Burdin, S.

AU - Buuck, M.

AU - Carmona-Benitez, M. C.

AU - Carter, M.

AU - Chawla, A.

AU - Chen, H.

AU - Chin, Y. T.

AU - Chott, N. I.

AU - Converse, M. V.

AU - Coronel, R.

AU - Cottle, A.

AU - Cox, G.

AU - Curran, D.

AU - Dahl, C. E.

AU - David, A.

AU - Delgaudio, J.

AU - Dey, S.

AU - de Viveiros, L.

AU - Di Felice, L.

AU - Ding, C.

AU - Dobson, J. E.Y.

AU - Druszkiewicz, E.

AU - Dubey, S.

AU - Eriksen, S. R.

PY - 2025/1/31

Y1 - 2025/1/31

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 T12/n22EC = (1.09 ± 0.14 stat ± 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 T12/n22EC = (1.09 ± 0.14 stat ± 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.

UR - https://www.scopus.com/pages/publications/86000308391

UR - https://www.scopus.com/pages/publications/86000308391#tab=citedBy

U2 - 10.1088/1361-6471/ad9039

DO - 10.1088/1361-6471/ad9039

M3 - Article

AN - SCOPUS:86000308391

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 -

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

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