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Study and suppression of anomalous fast events in inorganic scintillators for dark matter searches |
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| Authors: | V A Kudryavtsev N J C Spooner P K Lightfoot J W Roberts M J Lehner T Gamble M J Carson T B Lawson R Lüscher J E McMillan B Morgan S M Paling M Robinson D R Tovey N J T Smith P F Smith G J Alner S P Hart J D Lewin R M Preece T J Sumner W G Jones J J Quenby B Ahmed A Bewick D Davidge J V Dawson A S Howard I Ivaniouchenkov M K Joshi V Lebedenko I Liubarsky J C Barton G Gerbier J Mallet L Mosca C Tao |
| Institution: | a Department of Physics and Astronomy, University of Sheffield, The Hicks Building, Hounsfield Road, Sheffield S3 7RH, UK b Department of Particle Physics, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, UK c Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BZ, UK d Department of Physics, Queen Mary, University of London, London E1 4NS, UK e DSM/DAPNIA/SPP, C.E.A. Saclay, F-91191 Gif-sur-Yvette, France f CPPM, IN2P3/CNRS and Université Aix-Marseille II, F-13288 Marseille, Cedex 09, France |
| Abstract: | 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. |
| Keywords: | Scintillation detectors Inorganic crystals Dark matter WIMP Pulse shape analysis |
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