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Title: Identification and elimination of anomalous thermal decay in gamma-ray microcalorimeters

Microcalorimeter detectors rely on superconducting components and cryogenic temperatures to provide over an order-of-magnitude improvement in energy resolution compared to semiconducting sensors. Resolution improvements impact fields from gamma-ray astrophysics to nuclear safeguards. The temporal response of these detectors has been much slower than predicted from the known device parameters. This discrepancy has been attributed to the dynamics of quasiparticles and phonons in the bulk absorber used for absorbing photons. We will show that long-lived states in the glue used for absorber attachment have been the dominant cause of the slow response. Also, we have fabricated microcalorimeters using metal-to-metal diffusion bonding to attach the absorber. These detectors show a significant improvement in their recovery after gamma-ray events and will now enable study of the internal scattering dynamics of the bulk absorber.
Authors:
; ; ;  [1] ;  [2]
  1. National Institute of Standards and Technology, 325 Broadway MS 686.02, Boulder, Colorado 80305 (United States)
  2. Department of Physics and Astronomy, University of Denver, Denver, Colorado 80208 (United States)
Publication Date:
OSTI Identifier:
22217852
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 21; Other Information: (c) 2013 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; ASTROPHYSICS; BONDING; CALORIMETERS; COMPARATIVE EVALUATIONS; DECAY; ENERGY RESOLUTION; EQUIPMENT; GAMMA RADIATION; MATERIALS RECOVERY; METALS; PHONONS; PHOTONS; SAFEGUARDS; SCATTERING; SENSORS