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Measurement of the {}¹³⁶Xe 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

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
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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