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

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...

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Detalles Bibliográficos
Autores: 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., Cervera, A., Conde, C.A.N., Dafni, T., 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., Labarga, L., Lebrun, P., Liubarsky, I., Lorca, D., Losada, M., Luzón, G., 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., Webb, R., White, J.T., Yahlali, N., Yepes-Ramírez, H.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:56649
Acceso en línea:http://zaguan.unizar.es/record/56649
Access Level:acceso abierto
Descripción
Sumario: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.

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