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arxiv: 2111.11091 · v3 · pith:2HNMI2N6new · submitted 2021-11-22 · ⚛️ nucl-ex · hep-ex· physics.ins-det

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

NEXT Collaboration: P. Novella , M. Sorel , A. Us\'on , C. Adams , H. Almaz\'an , V. \'Alvarez , 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-Rodr\'iguez F.I.G.M. Borges S. Bounasser N. Byrnes S. C\'arcel J.V. Carri\'on S. Cebri\'an E. Church C.A.N. Conde T. Contreras F.P. Coss\'io A.A. Denisenko G. D\'iaz J. D\'iaz 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. G\'omez-Cadenas R. Gonz\'alez D. Gonz\'alez-D\'iaz R. Guenette R.M. Guti\'errez J. Haefner K. Hafidi J. Hauptman C.A.O. Henriques J.A. Hernando Morata P. Herrero-G\'omez V. Herrero J. Ho Y. Ifergan B.J.P. Jones M. Kekic L. Labarga A. Laing L. Larizgoitia P. Lebrun D. Lopez Gutierrez N. L\'opez-March M. Losada R.D.P. Mano J. Mart\'in-Albo A. Mart\'inez G. Mart\'inez-Lema M. Mart\'inez-Vara A.D. McDonald Z.E. Meziani K. Mistry F. Monrabal C.M.B. Monteiro F.J. Mora J. Mu\~noz Vidal K. Navarro D.R. Nygren E. Oblak M. Odriozola-Gimeno B. Palmeiro A. Para J. P\'erez M. Querol A. Raymond A.B. Redwine J. Renner L. Ripoll I. Rivilla Y. Rodr\'iguez Garc\'ia J. Rodr\'iguez C. Rogero L. Rogers B. Romeo C. Romo-Luque F.P. Santos J.M.F. dos Santos A. Sim\'on 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-ex hep-exphysics.ins-det
keywords betadecaydoublehalf-lifetextrmbackgrounddirectmeasurement
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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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