Simultaneous measurement of ionization and scintillation from nuclear recoils in liquid xenon for a dark matter experiment |
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| Authors: | Aprile E Dahl C E de Viveiros L Gaitskell R J Giboni K L Kwong J Majewski P Ni K Shutt T Yamashita M |
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| Affiliation: | Physics Department and Columbia Astrophysics Laboratory, Columbia University, New York, New York 10027, USA. age@astro.columbia.edu |
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| Abstract: | 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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