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

Abstract

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

Citation Formats

Prasai, K., Yanardag, S. Basak, Galeazzi, M., Uprety, Y., Alves, E., Rocha, J., Bagliani, D., Biasotti, M., Gatti, F., and Gomes, M. Ribeiro. Thermal properties of holmium-implanted gold films for a neutrino mass experiment with cryogenic microcalorimeters. United States: N. p., 2013. Web. doi:10.1063/1.4816640.
Prasai, K., Yanardag, S. Basak, Galeazzi, M., Uprety, Y., Alves, E., Rocha, J., Bagliani, D., Biasotti, M., Gatti, F., & Gomes, M. Ribeiro. Thermal properties of holmium-implanted gold films for a neutrino mass experiment with cryogenic microcalorimeters. United States. doi:10.1063/1.4816640.
Prasai, K., Yanardag, S. Basak, Galeazzi, M., Uprety, Y., Alves, E., Rocha, J., Bagliani, D., Biasotti, M., Gatti, F., and Gomes, M. Ribeiro. Thu . "Thermal properties of holmium-implanted gold films for a neutrino mass experiment with cryogenic microcalorimeters". United States. doi:10.1063/1.4816640.
@article{osti_22224168,
title = {Thermal properties of holmium-implanted gold films for a neutrino mass experiment with cryogenic microcalorimeters},
author = {Prasai, K. and Yanardag, S. Basak and Galeazzi, M. and Uprety, Y. and Alves, E. and Rocha, J. and Bagliani, D. and Biasotti, M. and Gatti, F. and Gomes, M. Ribeiro},
abstractNote = {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.},
doi = {10.1063/1.4816640},
journal = {Review of Scientific Instruments},
number = 8,
volume = 84,
place = {United States},
year = {Thu Aug 15 00:00:00 EDT 2013},
month = {Thu Aug 15 00:00:00 EDT 2013}
}
  • Experimental values of the monochromatic, near normal emittance, epsilon/sub lambda N/, of gold at cryogenic temperatures are presented and compared with values predicted by existing theoretical models. From this comparison recommendations are made regarding the engineering suitability of these models. Data obtained for epsilon/sub lambda N/ of gold in the wavelength range 1 to 30..mu.. and at temperatures of 300, 79, and 6.0/sup 0/K are compared with the Drude free electron model, the anomalous skin effect theory for both specular and diffuse electron reflections, and the Holstein quantum mechanical model. Results show that the anomalous skin effect model with diffusemore » electron reflections predicts epsilon/sub lambda N/ most accurately. At room temperature and at liquid nitrogen temperature the agreement between this model and the data is within 5 percent. At liquid helium temperatures the agreement is somewhat poorer, i.e., within 30 percent.« less
  • Here, microwave kinetic inductance detectors (MKID) provide a pathway to highly multiplexed, high-resolution, detectors. Over the past several years we have introduced the concept of the Thermal Kinetic Inductance Detector (TKID), which operates as a microcalorimeter. As with other microcalorimeters, the thermal noise of a TKID is reduced when the operating temperature is decreased. However, because the sensitivity of a TKID decreases as the operating temperature drops below 20% of T C, the T C of the resonator material must be tuned to match the desired operating temperature. We have investigated the WSimore » $$_{x}$$ alloy system as a material for these detectors. By co-sputtering from a Si andW2Si target, we have deposited WSi$$_{x}$$ films with a tunable T C that ranges from 5 K down to 500 mK. These films provide a large kinetic inductance fraction and relatively low noise levels. We provide results of these studies showing the T C, resistivity, quality factors, and noise as a function of deposition conditions. These results show that WSi$$_{x}$$ is a good candidate for TKIDs.« less