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

• DOI: 10.1016/j.physletb.2017.09.017
• Publication Date: 2017-09-12T19:16:01Z
• Authors: C.A.O. Henriques; E.D.C. Freitas; C.D.R. Azevedo; D. González-Díaz; R.D.P. Mano; M.R. Jorge; L.M.P. Fernandes; C.M.B. Monteiro; J.J. Gómez-Cadenas; V. Álvarez; J.M. Benlloch-Rod...; F.I.G.M. Borges; A. Botas; S. Cárcel; J.V. Carríon; S. Cebrían; C.A.N. Conde; J. Díaz; M. Diesburg; R. Esteve; R. Felkai; P. Ferrario; A.L. Ferreira; A. Goldschmidt; R.M. Gutiérrez; J. Hauptman; A.I. Hernandez; J.A. Hernando Morata; V. Herrero; B.J.P. Jones; L. Labarga; A. Laing; P. Lebrun; I. Liubarsky; N. López-March; M. Losada; J. Martín-Albo; G. Martínez-Lema; A. Martínez; A.D. McDonald; F. Monrabal; F.J. Mora; L.M. Moutinho; J. Muñoz Vidal; M. Musti; M. Nebot-Guinot; P. Novella; D.R. Nygren; B. Palmeiro; A. Para; J. Pérez; M. Querol; J. Renner; L. Ripoll; J. Rodríguez; L. Rogers; F.P. Santos; J.M.F. dos Santos; A. Simón; C. Sofka; M. Sorel; T. Stiegler; J.F. Toledo; J. Torrent; Z. Tsamalaidze; J.F.C.A. Veloso; R. Webb; J.T. White; N. Yahlali
• Keywords: Time projection chamber; Fano factor

Xe–CO2 mixtures are important alternatives to pure xenon in Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification with applications the field of rare event detection such as directional dark matter, double electron capture and beta decay detection. The addition CO2 at level 0.05–0.1% can reduce significantly scale diffusion from 10 mm/m 2.5 mm/m, high impact discrimination efficiency events through pattern recognition topology primary ionization trails. We have measured electroluminescence (EL) yield mixtures, sub-percent concentrations. demonstrate that EL production is still these 70% 35% relative produced xenon, for concentrations around 0.05% 0.1%, respectively. contribution statistical fluctuations energy resolution increases increasing concentration, being smaller than Fano factor below 0.1% CO2.