Cryogenic Gamma-ray spectrometers operated at temperatures around ~0.1 K offer an order of magnitude higher energy resolution than conventional Ge detectors. This greatly increases the precision of non-destructive isotope ratio measurements in complicated nuclear mixtures. We are developing Gamma-ray spectrometers based on bulk Sn absorber crystals attached to superconducting Mo/Cu thermistors. The Mo/Cu thermistor is operated at the superconducting-to-normal transition where its resistance changes sensitively with temperature. Gamma-ray capture increases the temperature of the Sn absorber in proportion to the Gamma energy, and this increase is recorded as a change in the resistance of the superconducting Mo/Cu sensor. For user-friendly operation, we have also developed a two-stage adiabatic demagnetization refrigerator that allows detector operation at ~0.1 K at the end of a cold finger within ~2 cm of a room temperature radioactive sample. Our spectrometer has achieved an energy resolution between 60 and 90 eV for Gamma energies up to 100 keV. For increased efficiency and count rate capabilities, we are currently developing detector arrays and the multiplexing technology required to read out many independent channels with a single SQUID preamplifier. We have already shown that two detector pixels can be multiplexed without loss in energy resolution. We will discuss the performance of the instrument in the context of precision analysis of radioactive samples for nuclear attribution.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/2411 must be provided.