Secondary scintillation yield of xenon with sub-percent levels of CO2 additive for rare-event detection

Henriques, C.A.O.
Freitas, Elisabete D.C.
Azevedo, C.D.R.
González-Díaz, Diego
Mano, R.D.P.
Jorge, M.R.
Fernandes, L.M.P.
Monteiro, Cristina M.B.
Gómez Cadenas, Juan José
Álvarez Puerta, Vicente
Benlloch Rodríguez, J.M.
Borges, Filipa I.G.M.
Botas, A.
Cárcel García, Sara
Carrión, J. V.
Cebrián, Susana
Conde, Carlos A.N.
Díaz Medina, José
Diesburg, M.
Esteve, Raúl
Felkai, R.
Ferrario, Paola
Ferreira, Antonio Luis
Goldschmidt, Azriel
Gutiérrez, Rafael María
Hauptman, John M.
Hernández, Andrés I.
Hernando Morata, J.A.
Herrero, Vicente
Jones, Benjamin J.P.
Labarga, Luis A.
Laing, Andrew
Lebrun, P.
Liubarsky, Igor
López-March, N.
Losada, Marta
Martín-Albo Simón, Justo
Martínez Lema, Gonzalo
Martínez Pérez, Alberto
McDonald, Alison D.
Monrabal Capilla, Francesc
Mora, Francisco José
Moutinho, L.M.
Muñoz Vidal, J.
Musti, M.
Nebot Guinot, Miquel
Novella, P.
Nygren, David R.
Palmeiro, B.
Para, A.
Pérez, Javier Martin
Querol, M.
Renner, Joshua
Rogers, L.
Santos, Filomena P.
dos Santos, Joaquim M.F.
Simón Estévez, Ander
Sofka, C.
Sorel, Michel
Stiegler, T.
Toledo, J.F.
Torrent Collell, Jordi
Tsamalaidze, Zviadi
Veloso, João F.C.A.
Webb, R.C.
White, James T.
Yahlali Haddou, Nadia
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Xe–CO2 mixtures are important alternatives to pure xenon in Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification with applications in the important field of rare event detection such as directional dark matter, double electron capture and double beta decay detection. The addition of CO2 to pure xenon at the level of 0.05–0.1% can reduce significantly the scale of electron diffusion from 10 mm/m to 2.5 mm/m, with high impact on the discrimination efficiency of the events through pattern recognition of the topology of primary ionization trails. We have measured the electroluminescence (EL) yield of Xe–CO2 mixtures, with sub-percent CO2 concentrations. We demonstrate that the EL production is still high in these mixtures, 70% and 35% relative to that produced in pure xenon, for CO2 concentrations around 0.05% and 0.1%, respectively. The contribution of the statistical fluctuations in EL production to the energy resolution increases with increasing CO2 concentration, being smaller than the contribution of the Fano factor for concentrations below 0.1% CO2 ​
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