Simultaneous measurement of ionization and scintillation from nuclear recoils in liquid xenon for a dark matter experiment

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Simultaneous measurement of ionization and scintillation from nuclear recoils in liquid xenon for a dark matter experiment

Aprile, E; Dahl, C E; de Viveiros, L; Gaitskell, R J; Giboni, K L; Kwong, J; Majewski, P; Ni, K; Shutt, T; Yamashita, M

Physical review letters, 08/2006, Volume: 97, Issue: 8

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We report the first measurements of the absolute ionization yield of nuclear recoils in liquid xenon, as a function of energy and electric field. Independent experiments were carried out with two dual-phase time-projection chamber prototypes, developed for the XENON dark matter project. We find that the charge yield increases with decreasing recoil energy, and exhibits only a weak field dependence. These results are the first unambiguous demonstration of the capability of dual-phase xenon detectors to discriminate between electron and nuclear recoils down to 20 keV, a key requirement for a sensitive dark matter search.

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