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Title: Thermal properties of holmium-implanted gold films for a neutrino mass experiment with cryogenic microcalorimeters

In a microcalorimetric neutrino mass experiment using the radioactive decay of {sup 163}Ho, the radioactive material must be fully embedded in the microcalorimeter absorber. One option that is being investigated is to implant the radioactive isotope into a gold absorber, as gold is successfully used in other applications. However, knowing the thermal properties at the working temperature of microcalorimeters is critical for choosing the absorber material and for optimizing the detector performance. In particular, it is paramount to understand if implanting the radioactive material in gold changes its heat capacity. We used a bolometric technique to measure the heat capacity of gold films, implanted with various concentrations of holmium and erbium (a byproduct of the {sup 163}Ho fabrication), in the temperature range 70 mK–300 mK. Our results show that the specific heat capacity of the gold films is not affected by the implant, making this a viable option for a future microcalorimeter holmium experiment.
Authors:
; ; ;  [1] ; ;  [2] ; ; ;  [3] ;  [4]
  1. Department of Physics, University of Miami, Coral Gables, Florida 33146 (United States)
  2. Centre for Nuclear Physics, University of Lisbon and IST-ID (Portugal)
  3. Department of Physics, University of Genova and INFN Genova (Italy)
  4. Centre for Nuclear Physics, University of Lisbon (Portugal)
Publication Date:
OSTI Identifier:
22224168
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABUNDANCE; CALORIMETERS; ECOLOGICAL CONCENTRATION; ELECTRON CAPTURE; ERBIUM; FILMS; GOLD; HOLMIUM; HOLMIUM 163; MASS NUMBER; NEUTRINOS; NUCLEAR DECAY; RADIOACTIVE MATERIALS; SPECIFIC HEAT; TEMPERATURE RANGE