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Palmer, J. Reichenbacher, J. R. Watson, J. Siniscalco, J. Soria, J. Tranter, J. W. Bargemann, J. Xu, K. Beattie, K. C. Oliver-Mallory, K. J. Palladino, K. Stifter, K. T. Lesko, K. Wild, K. Y Oyulmaz, L. de Viveiros, L. Di Felice, L. Korley, L. Kreczko, L. Weeldreyer, L. Wolf, M. A. Hernandez, M. Arthurs, M. Buuck, M. Carter, M. C. Carmona-Benitez, M. E. McCarthy, M. E. Monzani, M. G. D. van der Grinten, M. Horn, M. I. Lopes, M. Kannichankandy, M. Murdy, M. Szydagis, M. Timalsina, M. Trask, M. Tripathi, M. V. Converse, M. Williams, M. Yeh, N. Angelides, N. Fieldhouse, N. I. Chott, N. J. Pannifer, N. M. Fearon, N. Parveen, O. Valentino, P. A. Majewski, P. Br\\'as, P. Sorensen, Q. Riffard, Q. Xia, R. Coronel, R. Gibbons, R. J. Gaitskell, R. Kirk, R. L. Mannino, R. McMonigle, R. Rosero, R. S. James, R. Smith, R. W. Schnee, S. A. Hertel, S. Balashov, S. Burdin, S. Dey, S. Dubey, S. Fiorucci, S. Gokhale, S. Han, S. J. Haselschwardt, S. J. Patton, S. Kravitz, S. Luitz, S. R. Eriksen, S. Shaw, S. Woodford, T. J. Anderson, T. J. Sumner, T. J. Whitis, T. M. A. Fruth, T. P. Biesiadzinski, T. Pershing, T. Rushton, T. Shutt, V. A. Kudryavtsev, V. N. Solovov, V. Velan, W. H. Lippincott, W. J. Wisniewski, W. Lorenzon, W. Zha, Y. D. Kim, Y. Qie, Y. T. Chin, Y. Wang, Y. Xu, Z. Tong","submitted_at":"2024-08-30T16:28:15Z","abstract_excerpt":"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 (2$\\nu$2EC), utilizing a $1.39\\,\\mathrm{kg} \\times \\mathrm{yr}$ isotopic exposure from the first LZ science run. A half-life of $T_{1/2}^{2\\nu2\\mathrm{EC}} = (1.09 \\pm 0.14_{\\text{stat}} \\pm 0.05_{\\text{sys}}) \\times 10^{22}\\,\\mathrm{yr}$ is observed with a statistical significance of $8.3\\,\\sigma$, in agreement with literature. 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