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Insertion of STC into TRT at the Department of Physics, Oxford
Credit: CERN

Hans Kraus

Professor of Physics

Research theme

  • Particle astrophysics & cosmology

Sub department

  • Particle Physics

Research groups

  • LUX-ZEPLIN
Hans.Kraus@physics.ox.ac.uk
Telephone: 01865 (2)73361
Denys Wilkinson Building, room 623
  • About
  • Publications

Scintillation studies of Bi4Ge3O12 (BGO) down to a temperature of 6 K

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 594:3 (2008) 358-361

Authors:

J Gironnet, VB Mikhailik, H Kraus, P de Marcillac, N Coron

Abstract:

The scintillation light response and the decay time constant of Bi4Ge3O12 (BGO) were measured down to a temperature of 6 K using a multi-photon counting technique. The light response of BGO was confirmed to be temperature independent below 100 K and an estimate of the light yield was made, giving a value of 23,700±2600 ph/MeV. The temperature dependence of the scintillation decay time constant is interpreted using a simple three-level model for the emission centre which agrees well with the experimental data over the temperature range investigated. © 2008 Elsevier B.V. All rights reserved.
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Commissioning Run of the CRESST-II Dark Matter Search

(2008)

Authors:

G Angloher, M Bauer, I Bavykina, A Bento, A Brown, C Bucci, C Ciemniak, C Coppi, G Deuter, F von Feilitzsch, D Hauff, S Henry, P Huff, J Imber, S Ingleby, C Isaila, J Jochum, M Kiefer, M Kimmerle, H Kraus, J-C Lanfranchi, RF Lang, B Majorovits, M Malek, R McGowan, VB Mikhailik, E Pantic, F Petricca, S Pfister, W Potzel, F Proebst, W Rau, S Roth, K Rottler, C Sailer, K Schaeffner, J Schmaler, S Scholl, W Seidel, L Stodolsky, AJB Tolhurst, I Usherov, W Westphal
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Structure, luminescence and scintillation properties of the MgWO 4-MgMoO4 system

Journal of Physics Condensed Matter 20:36 (2008)

Authors:

VB Mikhailik, H Kraus, V Kapustyanyk, M Panasyuk, Y Prots, V Tsybulskyi, L Vasylechko

Abstract:

The importance of luminescent tungstates and molybdates in several technological applications motivated the study of the structural, luminescence and scintillation properties of the MgWO4-MgMoO4 system. X-ray diffraction studies allowed the identification of three main types of structures in the pseudo-binary MgWO4-MgMoO4 system (sanmartinite β-MgMoO4, cuprosheelite α-MgMoO4, and wolframite MgWO4) and the refinement of the parameters of the crystal lattice. It is found that the single-phase solid solution MgMo 1-xWxO4 with a β-MgMoO4 structure is created only at x<0.10, while for a higher tungsten content a mixture of different phases is formed. The x-ray luminescence spectra of a series of samples of the MgWO4-MgMoO4 system are measured at T = 8 K. The principal emission bands are assigned to the main structural phases as follows: β-MgMoO4, 520 nm; α-MgMoO4, 590 nm; MgWO4 (wolframite), 480 nm. The phase composition of the sample determines the actual shape of the observed spectra. Possible relations between the crystal structure and luminescence properties of different phases are discussed in terms of a configuration coordinate model. Of all the compounds under test, MgWO4 is found to have the best scintillation response for particle excitation (0.90 0.15 that of ZnWO4 at T = 295 K). Further, the light yield also remains high with decreasing temperature, which makes this material potentially useful for cryogenic applications. © 2008 IOP Publishing Ltd.
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The CRESST dark matter search

Journal of Physics Conference Series IOP Publishing 120:4 (2008) 042020

Authors:

W Seidel, G Angloher, M Bauer, I Bavykina, A Bento, A Brown, C Bucci, C Ciemniak, C Coppi, G Deuter, F Feilitzsch, D Hauff, S Henry, P Huff, J Imber, S Ingleby, C Isaila, J Jochum, M Kiefer, M Kimmerle, H Kraus, J-C Lanfranchi, R Lang, M Malek, R McGowan, V Mikhailik, E Pantic, F Petricca, S Pfister, W Potzel, F Pröbst, S Roth, K Rottler, C Sailer, K Schäffner, J Schmaler, S Scholl, L Stodolsky, B Tolhurst, I Usherow-Marshak, W Westphal

Abstract:

CRESST is a WIMP dark matter search using scintillating CaWO4 cryogenic detectors with active background suppression. First results obtained in the commissioning run are presented.
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Measurement of the superconducting transition temperature of Dural and titanium 6Al-4V alloys

Superconductor Science and Technology 21:6 (2008)

Authors:

U Divakar, S Henry, H Kraus, AJB Tolhurst

Abstract:

We have measured the superconducting transition temperatures of commercial alloys Dural and titanium 6Al-4V, to assess their suitability for use in the cryoEDM neutron electric dipole moment experiment. Our sample of aluminium alloy Dural became a superconductor at 0.84 0.07K but the titanium alloy did not show any superconducting behaviour down to the experimental limit of 0.17 0.11K. © IOP Publishing Ltd.
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