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

2022; American Physical Society; Volume: 105; Issue: 5 Linguagem: Inglês

10.1103/physrevc.105.055501

2470-0002

P. Novella, M. Sorel, A. Usón, C. Adams, H. Almazán, V. Álvarez, B. Aparicio, A. I. Aranburu, L. Arazi, I. J. Arnquist, S. Ayet, C.D.R. Azevedo, K. Bailey, F. Ballester, J. M. Benlloch-Rodríguez, F.I.G.M. Borges, S. Bounasser, N. Byrnes, S. Cárcel, J. V. Carrión, S. Cebrián, E. Church, C.A.N. Conde, T. Contreras, Fernando P. Cossío, A. A. Denisenko, G. Díaz, J. Dı́az, T. Dickel, J. Escada, R. Esteve, A. Fahs, R. Felkai, L. M. P. Fernandes, P. Ferrario, A. L. Ferreira, Frank W. Foss, E.D.C. Freitas, Zoraida Freixa, J. Generowicz, A. Goldschmidt, J.J. Gómez-Cadenas, R. González, D. González-Díaz, R. Guenette, Raquel Morentín Gutiérrez, J. Haefner, K. Hafidi, J. Hauptman, C. A. O. Henriques, J. A. Hernando Morata, Pablo Herrero, V. Herrero, J. Ho, Y. Ifergan, B. J. P. Jones, M. Kekic, L. Labarga, A. Laing, L. Larizgoitia, P. Lebrun, D. Lopez Gutierrez, N. López-March, M. Losada, R. D. P. Mano, J. Martín-Albo, A. Martínez, G. Martínez-Lema, M. Martínez-Vara, A. D. McDonald, Z. E. Meziani, K. Mistry, F. Monrabal, C. M. B. Monteiro, Francisco Mora, J. Muñoz Vidal, K. Navarro, D. R. Nygren, E. Oblak, Mikel Odriozola‐Gimeno, B. Palmeiro, A. Para, Juan C. Pérez, M. Querol, A. Raymond, A. B. Redwine, J. Renner, L. Ripoll, Iván Rivilla, Y. Rodríguez García, J. Rodríguez, Celia Rogero, L. Rogers, B. Romeo, C. Romo-Luque, F.P. Santos, J.M.F. dos Santos, A. Simón, C. Stanford, J. M. R. Teixeira, Pawan Thapa, J.F. Toledo, J. Torrent, J.F.C.A. Veloso, T. T. Vuong, R. Webb, J. T. White, K. Woodruff, N. Yahlali,

Particle physics theoretical and experimental studies

We report a measurement of the half-life of the 136Xe two-neutrino double-β decay performed with a novel direct-background-subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with 136Xe-enriched and 136Xe-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+0.80−0.46(stat)+0.30−0.17(sys)×1021yr is derived from the background-subtracted energy spectrum. The presented technique demonstrates the feasibility of unique background-model-independent neutrinoless double-β-decay searches.Received 25 November 2021Revised 25 January 2022Accepted 6 April 2022DOI:https://doi.org/10.1103/PhysRevC.105.055501©2022 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasDouble beta decayLifetimes & widthsNeutrinoless double beta decayNuclear structure & decaysRare decaysProperties90 ≤ A ≤ 149Nuclear PhysicsParticles & Fields