Study and suppression of anomalous fast events in inorganic scintillators for dark matter searches

Details Study and suppression of anomalous fast events in inorganic scintillators for dark matter searches Study and suppression of anomalous fast events in inorganic scintillators for dark matter searches

2001-09-12

arxiv.org/abs/hep-ex/0109013v1

Astropart.Phys.17:401-408,2002

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 6 figures

Scientific paper

10.1016/S0927-6505(01)00167-0

The status of dark matter searches with inorganic scintillator detectors at Boulby mine is reviewed and the results of tests with a CsI(Tl) crystal are presented. The objectives of the latter experiment were to study anomalous fast events previously observed and to identify ways to remove this background. Clear indications were found that these events were due to surface contamination of crystals by alphas, probably from radon decay. A new array of unencapsulated NaI(Tl) crystals immersed either in liquid paraffin or pure nitrogen atmosphere is under construction at Boulby. Such an approach allows complete control of the surface of the crystals and the ability to remove any surface contamination. First data from the unencapsulated NaI(Tl) do not show the presence of anomalous fast events.

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