Measurement of the response of heat-and-ionization germanium detectors to nuclear recoils

Abstract

The heat quenching factor Q' (the ratio of the heat signals produced by nuclear and electron recoils of equal energy) of the heat-and-ionization germanium bolometers used by the EDELWEISS collaboration has been measured. It is explained how this factor affects the energy scale and the effective quenching factor observed in calibrations with neutron sources. This effective quenching effect is found to be equal to Q/Q', where Q is the quenching factor of the ionization yield. To measure Q', a precise EDELWEISS measurement of Q/Q' is combined with values of Q obtained from a review of all available measurements of this quantity in tagged neutron beam experiments. The systematic uncertainties associated with this method to evaluate Q' are discussed in detail. For recoil energies between 20 and 100 keV, the resulting heat quenching factor is Q' = 0.91+-0.03+-0.04, where the two errors are the contributions from the Q and Q/Q' measurements, respectively. The present compilation of Q values and evaluation of Q' represent one of the most precise determinations of the absolute energy scale for any detector used in direct searches for dark matter.

arXiv comment28 pages, 7 figures. Submitted to Phys. Rev. D

References in corpus (8)

• Improved Exclusion Limits from the EDELWEISS WIMP Search
• Final results of the EDELWEISS-I dark matter search with cryogenic heat-and-ionization Ge detectors
• Exclusion Limits on the WIMP-Nucleon Cross-Section from the First Run of the Cryogenic Dark Matter Search in the Soudan Underground Lab
• Scintillation Response of Liquid Xenon to Low Energy Nuclear Recoils
• Measurements of Scintillation Efficiency and Pulse-Shape for Low Energy Recoils in Liquid Xenon
• SICANE: a Detector Array for the Measurement of Nuclear Recoil Quenching Factors using Monoenergetic Neutron Beam
• Calibration of the EDELWEISS Cryogenic Heat-and-ionisation Germanium Detectors for Dark Matter Search
• High-purity germanium detector ionization pulse shapes of nuclear recoils, gamma interactions and microphonism

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