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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 close to Qββ. 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 electronpositron 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

Journal of High Energy Physics, 2016, núm. 104

Scuola Internazionale Superiore di Studi Avanzati (SISSA)

Author: Ferrario, Paola
Laing, Andrew
López-March, N.
Gómez Cadenas, Juan José
Álvarez Puerta, Vicente
Azevedo, C.D.R.
Borges, Filipa I.G.M.
Cárcel García, Sara
Cebrián, Susana
Cervera Villanueva, Anselmo
Conde, Carlos A.N.
Dafni, Theopisti
Díaz Medina, José
Diesburg, M.
Esteve, Raúl
Fernandes, L.M.P.
Ferreira, Antonio Luis
Freitas, Elisabete D.C.
Gehman, Victor M.
Goldschmidt, Azriel
González-Díaz, Diego
Gutiérrez, Rafael María
Hauptman, John M.
Henriques, C.A.O.
Hernando Morata, J.A.
Irastorza, Igor Garcia
Labarga, Luis A.
Lebrun, P.
Liubarsky, Igor
Lorca Galindo, David
Losada, Marta
Luzón, Gloria
Marí, A.
Martín-Albo Simón, Justo
Martínez Lema, Gonzalo
Martínez Pérez, Alberto
Miller, Tom P.
Monrabal Capilla, Francesc
Monserrate, M.
Monteiro, Cristina M.B.
Mora, Francisco José
Moutinho, L.M.
Muñoz Vidal, J.
Nebot Guinot, Miquel
Novella, P.
Nygren, David R.
Para, A.
Pérez, Javier Martin
Pérez Aparicio, J.L.
Querol, M.
Renner, Joshua
Ripoll Masferrer, Lluís
Rodríguez Samaniego, Javier
Santos, Filomena P.
dos Santos, Joaquim M.F.
Serra Díaz-Cano, Luis
Shuman, Derek B.
Simón Estévez, Ander
Sofka, C.
Sorel, Michel
Toledo, J.F.
Torrent Collell, Jordi
Tsamalaidze, Zviadi
Veloso, João F.C.A.
Villar, José Ángel
Webb, R.C.
White, James T.
Yahlali Haddou, Nadia
Yepes-Ramírez, H.
Date: 2016 January 19
Abstract: 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 Qββ. 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 electronpositron 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
Format: application/pdf
Citation: 025211
ISSN: 1029-8479 (versió paper)
1126-6708 (versió electrònica)
Document access: http://hdl.handle.net/10256/13985
Language: eng
Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Collection: Reproducció digital del document publicat a: http://dx.doi.org/10.1007/JHEP01(2016)104
Articles publicats (D-EMCI)
Is part of: Journal of High Energy Physics, 2016, núm. 104
Rights: Attribution 4.0 Spain
Rights URI: http://creativecommons.org/licenses/by/4.0/es/
Subject: Matèria fosca (Astronomia)
Dark matter (Astronomy)
Desintegració beta
Beta Decay
Title: First proof of topological signature in the high pressure xenon gas TPC with electroluminescence amplification for the NEXT experiment
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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