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The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under Grant No. 951281-BOLD; the European Union's Framework Programme for Research and Innovation Horizon 2020 (2014-2020) under Grant No. 957202-HIDDEN; the MCIN/AEI/10.13039/501100011033 of Spain and ERDF "A way of making Europe" under Grant No. RTI2018-095979, the Severo Ochoa Program Grant No. CEX2018-000867-S, and the Maria de Maeztu Program Grant No. MDM-2016-0692; the Generalitat Valenciana of Spain under Grants No. PROMETEO/2021/087 and No. CIDEGENT/2019/049; the Portuguese FCT under Project No. UID/FIS/04559/2020 to fund the activities of LIBPhys-UC; the Pazy Foundation (Israel) under Grants No. 877040 and No. 877041; the U.S. Department of Energy under Contracts No. DE-AC02-06CH11357 (Argonne National Laboratory), No. DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), No. DE-FG02-13ER42020 (Texas A&M), No. DE-SC0019054 (Texas Arlington), and No. DE-SC0019223 (Arlington, TX); the U.S. National Science Foundation under Grant No. CHE 2004111; and the Robert A. Welch Foundation under Grant No. Y-203120200401. D.G.D. acknowledges support from the Ramon y Cajal program (Spain) under Contract No. RYC-2015-18820. Finally, we are grateful to the Laboratorio Subterraneo de Canfranc for hosting and supporting the NEXT experiment.

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Measurement of the 136Xe two-neutrino double-β-decay half-life via direct background subtraction in NEXT

Publicado en:Physical Review c. 105 (5): 55501- - 2022-05-10 105(5), DOI: 10.1103/PhysRevC.105.055501

Autores: Novella, P; Sorel, M; Uson, A; Adams, C; Almazan, H; Alvarez, V; Aparicio, B; Aranburu, A, I; Arazi, L; Arnquist, I J; Ayet, S; Azevedo, C D R; Bailey, K; Ballester, F; Benlloch-Rodriguez, J M; Borges, F I G M; Bounasser, S; Byrnes, N; Carcel, S; Carrion, J, V; Cebrian, S; Church, E; Conde, C A N; Contreras, T; Cossio, F P; Denisenko, A A; Diaz, G; Diaz, J; Dickel, T; Escada, J; Esteve, R; Fahs, A; Felkai, R; Fernandes, L M P; Ferrario, P; Ferreira, A L; Foss, F W; Freitas, E D C; Freixa, Z; Generowicz, J; Goldschmidt, A; Gomez-Cadenas, J J; Gonzalez, R; Gonzalez-Diaz, D; Guenette, R; Gutierrez, R M; Haefner, J; Hafidi, K; Hauptman, J; Henriques, C A O; Hernando Morata, J A; Herrero-Gomez, P; Herrero, V; Ho, J; Ifergan, Y; Jones, B J P; Kekic, M; Labarga, L; Laing, A; Larizgoitia, L; Lebrun, P; Gutierrez, D Lopez; Lopez-March, N; Losada, M; Mano, R D P; Martin-Albo, J; Martinez, A; Martinez-Lema, G; Martinez-Vara, M; McDonald, A D; Meziani, Z E; Mistry, K; Monrabal, F; Monteiro, C M B; Mora, F J; Vidal, J Munoz; Navarro, K; Nygren, D R; Oblak, E; Odriozola-Gimeno, M; Palmeiro, B; Para, A; Perez, J; Querol, M; Raymond, A; Redwine, A B; Renner, J; Ripoll, L; Rivilla, I; Rodriguez Garcia, Y; Rodriguez, J; Rogero, C; Rogers, L; Romeo, B; Romo-Luque, C; Santos, F P; dos Santos, J M F; Simon, A; Stanford, C; Teixeira, J M R; Thapa, P; Toledo, J F; Torrent, J; Veloso, J F C A; Vuong, T T; Webb, R; White, J T; Woodruff, K; Yahlali, N

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Resumen

We report a measurement of the half-life of the Xe-136 two-neutrino double-beta decay performed with a novel direct-background-subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with Xe-136-enriched and Xe-136-depleted xenon, as well as on the topology of double-electron tracks. With a fiducial mass of only 3.5 kg of Xe, a half-life of 2.34(-0.46)(+0.80) (stat)(-0.17)(+0.30) (sys) x 10(21) yr is derived from the background-subtracted energy spectrum. The presented technique demonstrates the feasibility of unique background-model-independent neutrinoless double-beta-decay searches.

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