γ-ray spectrometers prepared from high-purity germanium have been operated at low temperatures down to 5°K. The energy resolution of completely depleted detectors was the same at 5°K as at 77°K and no trapping-detrapping phenomena were observed. However, at sufficiently low bias voltage, slow components appeared on the pulses below 8°K. This effect is shown to be related to the increase in the resistivity of the undepleted region.
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Stuck et al. (1971) studied this question.