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Title: Studies of scintillation properties of CaMoO{sub 4} at millikelvin temperatures

Application of CaMoO{sub 4} as a scintillation target in cryogenic rare event searches relies on the understanding of scintillation properties of the material at the temperatures at which these detectors operate. We devised and implemented a detection module with a low-temperature photomultiplier from Hamamatsu (model R8520-06) powered by a Cockcroft-Walton generator. The detector module containing the CaMoO{sub 4} crystal was placed in a {sup 3}He/{sup 4}He dilution refrigerator and used to measure scintillation characteristics of CaMoO{sub 4} in the millikelvin temperature range. At the lowest temperature achieved, the energy resolution of CaMoO{sub 4} for 122 keV γ from a {sup 57}Co source is found to be 30%, and the fast and slow decay constants are 40.6 ± 0.8 μs and 3410 ± 50 μs, respectively. The temperature variation of the CaMoO{sub 4} decay kinetics is discussed in terms of a three-level model of the emission center.
Authors:
; ;  [1] ;  [2]
  1. Department of Physics, University of Oxford, Keble Rd., Oxford OX1 3RH (United Kingdom)
  2. Diamond Light Source, Harwell Science Campus, Didcot OX11 0DE (United Kingdom)
Publication Date:
OSTI Identifier:
22483273
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 24; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COBALT 57; CRYSTALS; DETECTION; DILUTION; ENERGY RESOLUTION; HELIUM 3; HELIUM 4; KEV RANGE 100-1000; REFRIGERATORS; SCINTILLATIONS