First proof of topological signature in the high pressure xenon gas TPC with electroluminescence amplification for the NEXT experiment

Ferrario, P. ; Laing, A. ; López-March, N. ; Gómez-Cadenas, J. J. ; Álvarez, V. ; Azevedo, C.D.R. ; Borges, F.I.G. ; Cárcel, S. ; Cebrián, S. (Universidad de Zaragoza) ; Cervera, A. ; Conde, C.A.N. ; Dafni, T. (Universidad de Zaragoza) ; Díaz, J. ; Diesburg, M. ; Esteve, R. ; Fernandes, L.M.P. ; Ferreira, A.L. ; Freitas, E.D.C. ; Gehman, V.M. ; Goldschmidt, A. ; González-Díaz, D. ; Gutiérrez, R. M. ; Hauptman, J. ; Henriques, C.A.O. ; Hernando Morata, J. A. ; Irastorza, I.G. (Universidad de Zaragoza) ; Labarga, L. ; Lebrun, P. ; Liubarsky, I. ; Lorca, D. ; Losada, M. ; Luzón, G. (Universidad de Zaragoza) ; Marí, A. ; Martín-Albo, J. ; Martínez-Lema, G. ; Martínez, A. ; Miller, T. ; Monrabal, F. ; Monserrate, M. ; Monteiro, C.M.B. ; Mora, F.J. ; Moutinho, L.M. ; Muñoz Vidal, J. ; Nebot-Guinot, M ; Novella, P. ; Nygren, D. ; Para, A. ; Pérez, J. ; Pérez Aparicio, J. L. ; Querol, M. ; Renner, J. ; Ripoll, L. ; Rodríguez, J. ; Santos, F.P. ; dos Santos, J. M. F. ; Serra, L. ; Shuman, D. ; Simón, A. ; Sofka, C. ; Sorel, M. ; Toledo, J.F. ; Torrent, J. ; Tsamalaidze, Z. ; Veloso, J.F.C.A. ; Villar, J.A. (Universidad de Zaragoza) ; Webb, R. ; White, J.T. ; Yahlali, N. ; Yepes-Ramírez, H.

Resumen: The NEXT experiment aims to observe the neutrinoless double beta decay of 136Xe in a high-pressure xenon gas TPC using electroluminescence (EL) to amplify the signal from ionization. One of the main advantages of this technology is the possibility to reconstruct the topology of events with energies close to Qßß. This paper presents the first demonstration that the topology provides extra handles to reject background events using data obtained with the NEXT-DEMO prototype. Single electrons resulting from the interactions of 22Na 1275 keV gammas and electron- positron pairs produced by conversions of gammas from the 228Th decay chain were used to represent the background and the signal in a double beta decay. These data were used to develop algorithms for the reconstruction of tracks and the identification of the energy deposited at the end-points, providing an extra background rejection factor of 24.3 ± 1.4 (stat.)%, while maintaining an efficiency of 66.7 ± 1.% for signal events.

Idioma: Inglés

DOI: 10.1007/JHEP01(2016)104

Año: 2016

Publicado en: Journal of High Energy Physics 01 (2016), 104 [18 pp.]
ISSN: 1126-6708

Factor impacto JCR: 6.063 (2016)

Categ. JCR: PHYSICS, PARTICLES & FIELDS rank: 3 / 29 = 0.103 (2016) - Q1 - T1

Factor impacto SCIMAGO: 1.163 - Nuclear and High Energy Physics (Q1)

Financiación: info:eu-repo/grantAgreement/EC/FP7/339787/EU/Towards the NEXT generation of bb0nu experimets/NEXT
Financiación: info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio-2010/CSD2008-00037
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2012-37947-C04
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FPA2009-13697-C04-04

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Atóm.Molec.y Nucl. (Dpto. Física Teórica)