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Phonon-mediated crystal detectors with metallic film coating capable of rejecting <i>α</i> and <i>β</i> events induced by surface radioactivity
Phonon-mediated particle detectors based on single crystals and operated at millikelvin temperatures are used in rare-event experiments for neutrino physics and dark-matter searches. In general, these devices are not sensitive to the particle impact point, especially if the detection is mediated by thermal phonons. In this Letter, we demonstrate that …