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Aprile, E.; Abe, K.; Agostini, F.; Alfonsi, M.; Althueser, L.; Andrieu, B.; Angelino, E.; Antón Martin, D.; Bellagamba, L.; Biondi, R.; Bismark, A.; Brown, A.; Bruenner, S.; Bruno, G.; Budnik, R.; Cai, C.; Clark, M.; Colijn, A. P.; Conrad, Jan; Decowski, M. P.; Di Stefano, R.; Diglio, S.; Elykov, A.; Farrell, S.; Ferella, A. D.; Gaior, R.; Gallo Rosso, Andrea; Galloway, M.; Glade-Beucke, R.; Grigat, J.; Higuera, A.; Hils, C.; Hoetzsch, L.; Howlett, J.; Iacovacci, M.; Itow, Y.; Joerg, F.; Joy, A.; Kato, N.; Kavrigin, P.; Kazama, S.; Kobayashi, M.; Koltman, G.; Landsman, H.; Lang, R. F.; Levinson, L.; Lindemann, S.; Lindner, M.; Liu, K.; Long, J.; Lopes, J. A. M.; Ma, Y.; Macolino, C.; Mahlstedt, J.; Mancuso, A.; Manenti, L.; Marignetti, F.; Martens, K.; Masbou, J.; Masson, E.; Mastroianni, S.; Moriyama, S.; Mosbacher, Y.; Ni, K.; Oberlack, U.; Paetsch, B.; Palacio, J.; Peres, R.; Plante, G.; Ramírez García, D.; Reichard, S.; Rocchetti, A.; Sanchez, L.; Dos Santos, J. M. F.; Sarnoff, I.; Schreiner, J.; Schulte, D.; Schulze Eißing, H.; Schumann, M.; Selvi, M.; Semeria, F.; Shagin, P.; Shi, S.; Shockley, E.; Silva, M.; Takeda, A.; Terliuk, A.; Thers, D.; Trinchero, G.; Tönnies, F.; Valerius, K.; Wei, Y.; Weinheimer, C.; Wenz, D.; Wittweg, C.; Wolf, T.; Xu, Z.; Yamashita, M.; Zavattini, G.; Zerbo, S.
Physical review. C, 2022, Volume: 106, Issue: 2Journal Article
We present results on the search for two-neutrino double-electron capture (2 ν ECEC) of 124 Xe and neutrinoless double- β decay (0 νββ ) of 136 Xe in XENON1T. We consider captures from the K shell up to the N shell in the 2 ν ECEC signal model and measure a total half-life of T 2 ν ECEC 1/2 =(1.1±0.2 stat ±0.1 sys )×10 22 yr with a 0.87 kg yr isotope exposure. The statistical significance of the signal is 7.0 σ . We use XENON1T data with 36.16 kg yr of 136 Xe exposure to search for 0 νββ . We find no evidence of a signal and set a lower limit on the half-life of T 0 νββ 1/2 >1.2×10 24 yr at 90%CL. This is the best result from a dark matter detector without an enriched target to date. We also report projections on the sensitivity of XENONnT to 0 νββ . Assuming a 275 kg yr 136 Xe exposure, the expected sensitivity is T 0 νββ 1/2 >2.1×10 25 yr at 90%CL, corresponding to an effective Majorana mass range of ⟨ mββ ⟩<(0.19–0.59)eV/c 2 .
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