KIP publications

year 2018
author(s) G. Kim, C.C. Flynn , S. Kempf, L. Gastaldo, A. Fleischmann2 , C. Enss, S. Friedrich
title Development of MMC Gamma Detectors for Precise Characterization of Uranium Isotopes
KIP-Nummer HD-KIP 18-167
KIP-Gruppe(n) F3,F4,F5
document type Paper
Keywords Metallic magnetic calorimeters Nuclear safeguards Uranium-233 Radium-225 Gamma detectors
source J. Low Temp. Phys. 193, 1236 (2018)
doi 10.1007/s10909-018-1978-0
Abstract (en)

Precise nuclear data from radioactive decays are important for the accurate non-destructive assay of fissile materials in nuclear safeguards. We are developing high energy resolution gamma detectors based on metallic magnetic calorimeters (MMCs) to accurately measure gamma-ray energies and branching ratios of uranium isotopes. Our MMC gamma detectors exhibit good linearity, reproducibility and a consistent response function for low energy gamma-rays. We illustrate the capabilities of MMCs to improve literature values of nuclear data with an analysis of gamma spectra of U233. In this context, we also improve the value of the energy for the single gamma-ray of the U-233 daughter Ra-225 by over an order of magnitude from 40.09 ± 0.05 to 40.0932 ± 0.0007 keV

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