P. Majewski

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

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.

Observation of anticorrelation between scintillation and ionization for MeV gamma rays in liquid xenon

A strong anticorrelation between ionization and scintillation signals produced by MeV

Scintillation response of liquid xenon to low energy nuclear recoils

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Proportional light in a dual-phase xenon chamber

rays in liquid xenon has been measured and used to improve the energy resolution by combining the two signals. The improvement is explained by reduced electron-ion recombination fluctuations of the combined signal compared to fluctuations of the individual signals. Simultaneous measurements of ionization and scintillation signals were carried out with

Performance of a large area avalanche photodiode in a liquid xenon ionization and scintillation chamber

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Fast timing measurements of gamma-ray events in liquid xenon

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Performance of dual phase XeTPC with CsI photocathode and PMTs readout for the scintillation light

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Measurement of the ionization and scintillation yield of nuclear recoils in liquid xenon

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The XENON dark matter search experiment

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