Ionization and scintillation response of high-pressure xenon gas to alpha particles

Álvarez Puerta, Vicente
Borges, Filipa I.G.M
Cárcel García, Sara
Cebrián, Susana
Cervera Villanueva, Anselmo
Conde, Carlos A.N
Dafni, Theopisti
Díaz Medina, José
Egorov, M.
Esteve, Raúl
Evtoukhovitch, P.
Fernandes, L.M.P.
Ferrario, Paola
Ferreira, Antonio Luis
Freitas, Elisabete D.C.
Gehman, Victor M.
Gil Ortiz, Alejandro
Goldschmidt, Azriel
Gómez, H.
Gómez Cadenas, Juan José
González-Díaz, Diego
Gutiérrez, Rafael María
Hauptman, John M.
Hernando Morata, J.A.
Herrera, D.C.
Irastorza, Igor Garcia
Jinete, M.A.
Labarga, Luis A.
Laing, Andrew
Liubarsky, Igor
Lopes, J.A.M.
Lorca Galindo, David
Losada, Marta
Luzón, Gloria
Marí, A.
Martín-Albo Simón, Justo
Miller, Tom P.
Moiseenko, A.
Monrabal Capilla, Francesc
Monteiro, Cristina M.B.
Mora, Francisco José
Moutinho, L.M.
Muñoz Vidal, J.
Natal da Luz, H.
Navarro, G.
Nebot Guinot, Miquel
Nygren, David R.
Oliveira, Carlos A.B.
Palma, R.
Pérez, Javier Martin
Pérez Aparicio, J.L.
Renner, Joshua
Rodríguez, Ángel Y.
Santos, Filomena P.
dos Santos, Joaquim M.F.
Seguí, Laura
Serra Díaz-Cano, Luis
Shuman, Derek B.
Simón Estévez, Ander
Sofka, C.
Sorel, Michel
Toledo, J.F.
Tomás, A.
Torrent Collell, Jordi
Tsamalaidze, Zviadi
Vázquez, D.
Veloso, João F.C.A.
Webb, R.C.
White, James T.
Yahlali Haddou, Nadia
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High-pressure xenon gas is an attractive detection medium for a variety of applications in fundamental and applied physics. In this paper we study the ionization and scintillation detection properties of xenon gas at 10 bar pressure. For this purpose, we use a source of alpha particles in the NEXT-DEMO time projection chamber, the large scale prototype of the NEXT-100 neutrinoless double beta decay experiment, in three different drift electric field configurations. We measure the ionization electron drift velocity and longitudinal diffusion, and compare our results to expectations based on available electron scattering cross sections on pure xenon. In addition, two types of measurements addressing the connection between the ionization and scintillation yields are performed. On the one hand we observe, for the first time in xenon gas, large event-by-event correlated fluctuations between the ionization and scintillation signals, similar to that already observed in liquid xenon. On the other hand, we study the field dependence of the average scintillation and ionization yields. Both types of measurements may shed light on the mechanism of electron-ion recombination in xenon gas for highly-ionizing particles. Finally, by comparing the response of alpha particles and electrons in NEXT-DEMO, we find no evidence for quenching of the primary scintillation light produced by alpha particles in the xenon gas ​
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