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Martínez-Lema, G.; Martínez-Vara, M.; Sorel, M.; Adams, C.; Álvarez, V.; Arazi, L.; Arnquist, I. J.; Azevedo, C. D. R; Bailey, K.; Ballester, F.; Benlloch-Rodríguez, J. M.; Borges, F. I. G. M.; Byrnes, N.; Cárcel, S.; Carrión, J. V.; Cebrián, S.; Church, E.; Conde, C. A. N.; Contreras, T.; Díaz, G.; Díaz, J.; Diesburg, M.; Escada, J.; Esteve, R.; [...]

Sensitivity of the NEXT experiment to Xe-124 double electron capture

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  • Medientyp: E-Artikel
  • Titel: Sensitivity of the NEXT experiment to Xe-124 double electron capture
  • Beteiligte: Martínez-Lema, G.; Martínez-Vara, M.; Sorel, M.; Adams, C.; Álvarez, V.; Arazi, L.; Arnquist, I. J.; Azevedo, C. D. R; Bailey, K.; Ballester, F.; Benlloch-Rodríguez, J. M.; Borges, F. I. G. M.; Byrnes, N.; Cárcel, S.; Carrión, J. V.; Cebrián, S.; Church, E.; Conde, C. A. N.; Contreras, T.; Díaz, G.; Díaz, J.; Diesburg, M.; Escada, J.; Esteve, R.; [...]
  • Erschienen: Springer Science and Business Media LLC, 2021
  • Erschienen in: Journal of High Energy Physics
  • Sprache: Englisch
  • DOI: 10.1007/jhep02(2021)203
  • ISSN: 1029-8479
  • Schlagwörter: Nuclear and High Energy Physics
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: <jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>Double electron capture by proton-rich nuclei is a second-order nuclear process analogous to double beta decay. Despite their similarities, the decay signature is quite different, potentially providing a new channel to measure the hypothesized neutrinoless mode of these decays. The Standard-Model-allowed two-neutrino double electron capture (2<jats:italic>νEC EC</jats:italic>) has been predicted for a number of isotopes, but only observed in <jats:sup>78</jats:sup>Kr, <jats:sup>130</jats:sup>Ba and, recently, <jats:sup>124</jats:sup>Xe. The sensitivity to this decay establishes a benchmark for the ultimate experimental goal, namely the potential to discover also the lepton-number-violating neutrinoless version of this process, 0<jats:italic>νEC EC</jats:italic>. Here we report on the current sensitivity of the NEXT-White detector to <jats:sup>124</jats:sup>Xe 2<jats:italic>νEC EC</jats:italic> and on the extrapolation to NEXT-100. Using simulated data for the 2<jats:italic>νEC EC</jats:italic> signal and real data from NEXT-White operated with <jats:sup>124</jats:sup>Xe-depleted gas as background, we define an optimal event selection that maximizes the NEXT-White sensitivity. We estimate that, for NEXT-100 operated with xenon gas isotopically enriched with 1 kg of <jats:sup>124</jats:sup>Xe and for a 5-year run, a sensitivity to the 2<jats:italic>νEC EC</jats:italic> half-life of 6 <jats:italic>×</jats:italic> 10<jats:sup>22</jats:sup> y (at 90% confidence level) or better can be reached.</jats:p>
  • Zugangsstatus: Freier Zugang