Measurement of the ${}^{136}$Xe two-neutrino double beta decay half-life
via direct background subtraction in NEXT
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. A. Díaz,J. Díaz,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. C. Gonzalez,D. González-Díaz,R. Guénette,Rafael Gutiérrez,J. Haefner,K. Hafidi,J. M. Hauptman,C. A. O. Henriques,J. A. Hernando Morata,P. Herrero-Gómez,V. Herrero,Johnny C. Ho,Y. Ifergan,Ben 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,M. Odriozola-Gimeno,B. Palmeiro,A. Para,Juan C. Pérez,M. Querol,Anne 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
Zaguan (Universidad de Zaragoza)（2021）
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摘要
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.
