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Two-neutrino double electron capture of 124Xe in the first LUX-ZEPLIN exposure
- 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;
- Brew, CAJ;
- Brás, P;
- Burdin, S;
- Buuck, M;
- Carmona-Benitez, MC;
- Carter, M;
- Chawla, A;
- Chen, H;
- Chin, YT;
- Chott, NI;
- Converse, MV;
- Coronel, R;
- Cottle, A;
- Cox, G;
- Curran, D;
- Dahl, CE;
- David, A;
- Delgaudio, J;
- Dey, S;
- de Viveiros, L;
- Di Felice, L;
- Ding, C;
- Dobson, JEY;
- Druszkiewicz, E;
- Dubey, S;
- Eriksen, SR;
- Fan, A;
- Fearon, NM;
- Fieldhouse, N;
- Fiorucci, S;
- Flaecher, H;
- Fraser, ED;
- Fruth, TMA;
- Gaitskell, RJ;
- Geffre, A;
- Genovesi, J;
- Ghag, C;
- Gibbons, R;
- Gokhale, S;
- Green, J;
- van der Grinten, MGD;
- Haiston, JJ;
- Hall, CR;
- Han, S;
- Hartigan-OConnor, E;
- Haselschwardt, SJ;
- Hernandez, MA;
- Hertel, SA;
- Heuermann, G;
- Homenides, GJ;
- Horn, M;
- Huang, DQ;
- Hunt, D;
- Jacquet, E;
- James, RS;
- Johnson, J;
- Kaboth, AC;
- Kamaha, AC;
- Kannichankandy, M;
- Khaitan, D;
- Khazov, A;
- Khurana, I;
- Kim, J;
- Kim, YD;
- Kingston, J;
- Kirk, R;
- Kodroff, D;
- Korley, L;
- Korolkova, EV;
- Kraus, H;
- Kravitz, S;
- Kreczko, L;
- Kudryavtsev, VA;
- Leonard, DS;
- Lesko, KT;
- Levy, C;
- Lin, J;
- Lindote, A;
- Lippincott, WH;
- Lopes, MI;
- Lorenzon, W;
- Lu, C;
- Luitz, S;
- Majewski, PA;
- Manalaysay, A;
- Mannino, RL;
- Maupin, C;
- McCarthy, ME;
- McDowell, G;
- McKinsey, DN;
- McLaughlin, J;
- McLaughlin, JB;
- McMonigle, R;
- Mizrachi, E;
- Monte, A;
- Monzani, ME;
- Morrison, E;
- Mount, BJ;
- Murdy, M;
- Murphy, ASJ;
- Naylor, A;
- Nelson, HN;
- Neves, F;
- Nguyen, A;
- O’Brien, CL;
- Olcina, I;
- Oliver-Mallory, KC;
- Orpwood, J;
- Oyulmaz, KY;
- Palladino, KJ;
- Palmer, J;
- Pannifer, NJ;
- Parveen, N;
- Patton, SJ;
- Penning, B;
- Pereira, G;
- Perry, E;
- Pershing, T;
- Piepke, A;
- Qie, Y;
- Reichenbacher, J;
- Rhyne, CA;
- Riffard, Q;
- Rischbieter, GRC;
- Ritchey, E;
- Riyat, HS;
- Rosero, R;
- Rushton, T;
- Rynders, D;
- Santone, D;
- Sazzad, ABMR;
- Schnee, RW;
- Sehr, G;
- Shafer, B;
- Shaw, S;
- Shutt, T;
- Silk, JJ;
- Silva, C;
- Sinev, G;
- Siniscalco, J;
- Smith, R;
- Solovov, VN;
- Sorensen, P;
- Soria, J;
- Stevens, A;
- Stifter, K;
- Suerfu, B;
- Sumner, TJ;
- Szydagis, M;
- Tiedt, DR;
- Timalsina, M;
- Tong, Z;
- Tovey, DR;
- Tranter, J;
- Trask, M;
- Tripathi, M;
- Vacheret, A;
- Vaitkus, AC;
- Valentino, O;
- Velan, V;
- Wang, A;
- Wang, JJ;
- Wang, Y;
- Watson, JR;
- Weeldreyer, L;
- Whitis, TJ;
- Wild, K;
- Williams, M;
- Wisniewski, WJ;
- Wolf, L;
- Wolfs, FLH;
- Woodford, S;
- Woodward, D;
- Wright, CJ;
- Xia, Q;
- Xu, J;
- Xu, Y;
- Yeh, M;
- Yeum, D;
- Zha, W;
- Zweig, EA
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.