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 (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 (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.affiliation: Department of Physics, University of Miami, Coral Gables, Florida 33146, USA.
authors.forename: K
authors.initials: K
authors.lastname: Prasai
authors.forename: E
authors.initials: E
authors.lastname: Alves
authors.forename: D
authors.initials: D
authors.lastname: Bagliani
authors.forename: S
authors.initials: S
authors.lastname: Basak Yanardag
authors.forename: M
authors.initials: M
authors.lastname: Biasotti
authors.forename: M
authors.initials: M
authors.lastname: Galeazzi
authors.forename: F
authors.initials: F
authors.lastname: Gatti
authors.forename: M
authors.initials: M
authors.lastname: Ribeiro Gomes
authors.forename: J
authors.initials: J
authors.lastname: Rocha
authors.forename: Y
authors.initials: Y
authors.lastname: Uprety