JLow Temp Phys https://doi.org/10.1007/s10909-018-1978-0 Development of MMC Gamma Detectors for Precise Characterization of Uranium Isotopes 1 1 2 2 G. B. Kim · C. C. Flynn · S. Kempf · L. Gastaldo · 2 2 1 A. Fleischmann · C. Enss · S. Friedrich Received: 6 October 2017 / Accepted: 20 May 2018 © This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection 2018 Abstract 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 U- 233. 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
Journal of Low Temperature Physics – Springer Journals
Published: Jun 1, 2018
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