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The CRESST dark matter search

(2005) 212-217

Authors:

B Majorovits, C Cozzini, S Henry, H Kraus, V Mikhailik, AJB Tolhurst, D Wahl, Y Ramachers, G Angloher, P Christ, D Hauff, J Ninkovic, F Petricca, F Probst, W Seidel, L Stodolsky, FV Feilitzsch, T Jagemann, W Potzel, M Razeti, W Rau, M Stark, W Westphal, H Wulandari, J Jochum, C Bucci

Abstract:

We present first competitive results on WIMP dark matter using the phonon-light-detection technique. A particularly strong limit for WIMPs with coherent scattering results from selecting a region of the phonon-light plane corresponding to tungsten recoils. The observed count rate in the neutron band is compatible with the rate expected from neutron background. CRESST is presently being upgraded with a 66 channel SQUID readout system, a neutron shield and a muon veto system. This results in a significant improvement in sensitivity.
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Lattice dynamics and thermal properties of CaWO4

Physical Review B - Condensed Matter and Materials Physics 70:21 (2004) 1-9

Authors:

A Senyshyn, H Kraus, VB Mikhailik, V Yakovyna

Abstract:

Thermodynamic properties of CaWO4 were studied using the GULP code incorporating semiclassical simulations based on quasiharmonic lattice dynamics and static lattice minimisation methods. Free energy minimization along with so called "relax" fitting was used to obtain the parameters characterising the interatomic interaction potential. From analyses of the calculated and experimental cell sizes, thermal expansion coefficients, elastic constants, phonon density of states, heat capacity, entropy, and Grüneisen parameters it is concluded that quasiharmonic lattice dynamics give a good description of these properties of CaWO4 at temperatures up to 800 K.
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Detection of the natural alpha decay of tungsten

Physical Review C 70 (2004) 064606 6 pages

Authors:

H Kraus, C Cozzini, Y Ramachers, F Proebst
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Detection of the Natural Alpha Decay of Tungsten

(2004)

Authors:

C Cozzini, G Angloher, C Bucci, F von Feilitzsch, D Hauff, S Henry, Th Jagemann, J Jochum, H Kraus, B Majorovits, V Mikhailik, J Ninkovic, F Petricca, W Potzel, F Proebst, Y Ramachers, W Rau, M Razeti, W Seidel, M Stark, L Stodolsky, AJB Tolhurst, W Westphal, H Wulandari
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Two-photon excitation and luminescence of a CaWO4 scintillator

RADIAT MEAS 38:4-6 (2004) 585-588

Authors:

VB Mikhailik, IK Bailiff, H Kraus, PA Rodnyi, J Ninkovic

Abstract:

Luminescence of a CaWO4 scintillator was studied in the temperature range 77-500 K using intense laser excitation in the 450-600 nm spectral region. Characteristics of the observed blue emission are similar to those of the intrinsic luminescence of calcium tungstate. The emission is concluded to be caused by cascade excitation of CaWO4 that results in a two-photon excited (TPE) luminescence. The features of TPE luminescence of CaWO4 are analysed in comparison to those obtained with UV and X-ray excitation. (C) 2004 Elsevier Ltd. All rights reserved.
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