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Fracture processes studied in CRESST

Abstract : In the early stages of running of the CRESST dark matter search with sapphire crystals as detectors, an unexpectedly high rate of signal pulses appeared. Their origin was finally traced to fracture events in the sapphire due to the very tight clamping of the detectors. During extensive runs the energy and time of each event was recorded, providing large data sets for such phenomena. We believe this is the first time that the energy release in fracture has been accurately measured on a microscopic event-by-event basis. The energy distributions appear to follow a power law, dN/dEis proportional to E-β, similar to the Gutenberg–Richter power law for earthquake magnitudes, and after appropriate translation, with a similar exponent. In the time domain, the autocorrelation function shows time correlations lasting for substantial parts of an hour. Some remarks are made concerning the possible role of such mechanical stress release processes in the noise of sensitive cryodetectors.
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Contributor : Sylvie Flores <>
Submitted on : Friday, May 5, 2006 - 10:31:18 AM
Last modification on : Tuesday, November 19, 2019 - 2:38:30 AM




J. Angström, F. Pröbst, P.C.F. Di Stefano, L. Stodolsky, J. Timonen, et al.. Fracture processes studied in CRESST. 11th International Workshop on Low Temperature Detectors - LTD-11, Jul 2005, Tokyo, Japan. pp.754-756, ⟨10.1016/j.nima.2005.12.127⟩. ⟨in2p3-00026022⟩



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