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Sensitivity of NEXT-100 to neutrinoless double beta decay

  • Author(s): Martín-Albo, J;
  • Muñoz Vidal, J;
  • Ferrario, P;
  • Nebot-Guinot, M;
  • Gómez-Cadenas, JJ;
  • Álvarez, V;
  • Azevedo, CDR;
  • Borges, FIG;
  • Cárcel, S;
  • Carrión, JV;
  • Cebrián, S;
  • Cervera, A;
  • Conde, CAN;
  • Díaz, J;
  • Diesburg, M;
  • Esteve, R;
  • Fernandes, LMP;
  • Ferreira, AL;
  • Freitas, EDC;
  • Goldschmidt, A;
  • González-Díaz, D;
  • Gutiérrez, RM;
  • Hauptman, J;
  • Henriques, CAO;
  • Hernando Morata, JA;
  • Herrero, V;
  • Labarga, L;
  • Laing, A;
  • Lebrun, P;
  • Liubarsky, I;
  • López-March, N;
  • Lorca, D;
  • Losada, M;
  • Martínez-Lema, G;
  • Martínez, A;
  • Monrabal, F;
  • Monteiro, CMB;
  • Mora, FJ;
  • Moutinho, LM;
  • Novella, P;
  • Nygren, D;
  • Palmeiro, B;
  • Para, A;
  • Querol, M;
  • Renner, J;
  • Ripoll, L;
  • Rodríguez, J;
  • Santos, FP;
  • dos Santos, JMF;
  • Serra, L;
  • Shuman, D;
  • Simón, A;
  • Sofka, C;
  • Sorel, M;
  • Stiegler, T;
  • Toledo, JF;
  • Torrent, J;
  • Tsamalaidze, Z;
  • Veloso, JFCA;
  • Webb, R;
  • White, JT;
  • Yahlali, N;
  • Yepes-Ramírez, H
  • et al.
Abstract

Abstract: NEXT-100 is an electroluminescent high-pressure xenon gas time projection chamber that will search for the neutrinoless double beta (0νββ) decay of 136Xe. The detector possesses two features of great value for 0νββ searches: energy resolution better than 1% FWHM at the Q value of 136Xe and track reconstruction for the discrimination of signal and background events. This combination results in excellent sensitivity, as discussed in this paper. Material-screening measurements and a detailed Monte Carlo detector simulation predict a background rate for NEXT-100 of at most 4 × 10−4 counts keV−1 kg−1 yr−1. Accordingly, the detector will reach a sensitivity to the 0νββ-decay half-life of 2.8 × 1025 years (90% CL) for an exposure of 100 kg·year, or 6.0 × 1025 years after a run of 3 effective years.[Figure not available: see fulltext.]

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