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Measurement of the ${}^{136}$Xe two-neutrino double beta decay half-life via direct background subtraction in NEXT

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arxiv 2111.11091 v3 pith:2HNMI2N6 submitted 2021-11-22 nucl-ex hep-exphysics.ins-det

NEXT Collaboration: P. Novella , M. Sorel , A. Usón , C. Adams , H. Almazán , V. Álvarez , B. Aparicio , A.I. Aranburu
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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 F.P. Cossío A.A. Denisenko G. Díaz J. Díaz T. Dickel J. Escada R. Esteve A. Fahs R. Felkai L.M.P. Fernandes P. Ferrario A.L. Ferreira F.W. Foss E.D.C. Freitas Z. Freixa J. Generowicz A. Goldschmidt J.J. Gómez-Cadenas R. González D. González-Díaz R. Guenette R.M. Gutiérrez J. Haefner K. Hafidi J. Hauptman C.A.O. Henriques J.A. Hernando Morata P. Herrero-Gómez 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 F.J. Mora J. Muñoz Vidal K. Navarro D.R. Nygren E. Oblak M. Odriozola-Gimeno B. Palmeiro A. Para J. Pérez M. Querol A. Raymond A.B. Redwine J. Renner L. Ripoll I. Rivilla Y. Rodríguez García J. Rodríguez C. Rogero L. Rogers B. Romeo C. Romo-Luque F.P. Santos J.M.F. dos Santos A. Simón C. Stanford J.M.R. Teixeira P. Thapa J.F. Toledo J. Torrent J.F.C.A. Veloso T.T. Vuong R. Webb J.T. White K. Woodruff N. Yahlali
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classification nucl-exhep-exphysics.ins-det
keywords betadecaydoublehalf-lifetextrmbackgrounddirectmeasurement
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We report a measurement of the half-life of the ${}^{136}$Xe 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 ${}^{136}$Xe-enriched and ${}^{136}$Xe-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 $2.34^{+0.80}_{-0.46}\textrm{(stat)}^{+0.30}_{-0.17}\textrm{(sys)}\times10^{21}~\textrm{yr}$ 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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  1. Search for Double Beta Decay of $^{136}$Xe to the $0^+_1$ Excited State of $^{136}$Ba with PandaX-4T

    nucl-ex 2025-02 conditional novelty 5.0 of 10

    PandaX-4T finds no double beta decay of 136Xe to the 0+1 excited state of 136Ba and sets a half-life limit of 7.5e22 years at 90% confidence.

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