Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 17: Cryogenic Detectors and Cryotechnique
TT 17.2: Talk
Wednesday, September 7, 2022, 09:45–10:00, H22
Beta spectrometry measurements with metallic magnetic calorimeters — •Michael Paulsen1, Jörn Beyer1, Christian Enss2,6, Sebastian Kempf3,6, Karsten Kossert4, Martin Loidl5, Riham Mariam5, Ole Nähle4, Philipp Ranitzsch4, Matias Rodrigues5, and Mathias Wegner6,3 — 1Physikalisch-Technische Bundesanstalt, Berlin, Germany — 2Kirchhoff-Institute for Physics, Heidelberg University, Germany — 3Institute of Micro- and Nanoelectronic Systems, Karlsruhe Institute of Technology, Germany — 4Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 5Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel, Palaiseau, France — 6Institute for Data Processing and Electronics, Karlsruhe Institute of Technology, Germany
Precise beta spectra measurements are important for radionuclide metrology, the validation of theoretical calculations and nuclear medicine. Metallic Magnetic Calorimeters (MMCs) with the radionuclide sample embedded in a 4π absorber have proven to be among the best beta spectrometers in terms of energy resolution and threshold, linearity and detection efficiency, notably for low energy beta transitions. In this work, two measurements of the spectrum of the 2nd forbidden non-unique beta transition of 99Tc (Q− = 297.5 keV) are presented. They were acquired using two independent MMC based detectors in two different laboratories and show excellent agreement. The results suggest a spectral shape which deviates significantly from hitherto theoretical calculations and semi-empirical extrapolations at lower energies (< 50 keV) reported in the literature.