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New insights into particle detection with superheated liquids - IOPscience
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New insights into particle detection with superheated liquids

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Published 7 April 2011 Published under licence by IOP Publishing Ltd
, , Citation S Archambault et al 2011 New J. Phys. 13 043006 DOI 10.1088/1367-2630/13/4/043006

1367-2630/13/4/043006

Abstract

We report new results obtained from calibrations of superheated liquid droplet detectors used in dark matter searches with different radiation sources (n, αあるふぁ, γがんま). In particular, detectors were spiked with αあるふぁ-emitters located inside and outside the droplets. It is shown that the responses have different temperature thresholds, depending on whether αあるふぁ-particles or recoil nuclei create the signals. The measured temperature threshold for recoiling 210Pb nuclei from 214Po αあるふぁ-decays was found to be in agreement with test beam measurements using mono-energetic neutrons. A comparison of the threshold data with theoretical predictions shows deviations, especially at high temperatures. It is shown that signals produced simultaneously by recoil nuclei and αあるふぁ-particles have more acoustic energy than signals produced by one or the other separately. A model is presented that describes how the observed intensities of particle-induced acoustic signals can be related to the dynamics of bubble growth in superheated liquids. A growth scenario that is limited by the inertia of the surrounding liquid shows a trend that is supported by the data. An improved understanding of the bubble dynamics is an important first step in obtaining better discrimination between particle types interacting in detectors of this kind.

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10.1088/1367-2630/13/4/043006