Measurement of the electron capture probabilities of 55Fe with a metallic magnetic calorimeter

M. Loidl 1 M. Rodrigues 1 R. Mariam 1
1 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : The ratios of the electron capture probabilities P-K, P-L and P-M of Fe-55 have been measured with a metallic magnetic calorimeter, a specific type of cryogenic detector. The Fe-55 source was enclosed in the detector absorber, whose dimensions were chosen such that the detection efficiency for Mn K X-rays was larger than 99.99%. Since all electrons and photons emitted by the source are absorbed in the detector, the detection efficiency is virtually 100% for K, L and M captures. The energy threshold was low enough to allow for clear separation of the M captures (similar to 80 eV) from noise. The capture probability ratios were translated to capture probabilities using the recommended value for the probability of the undetected N captures. The resulting values are in agreement both with the recommended values of P-K, P-L and P-M and with the experimental data of Pengra and coworkers.
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Submitted on : Thursday, May 31, 2018 - 7:55:25 AM
Last modification on : Wednesday, September 4, 2019 - 1:40:15 PM

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M. Loidl, M. Rodrigues, R. Mariam. Measurement of the electron capture probabilities of 55Fe with a metallic magnetic calorimeter. Applied Radiation and Isotopes, Elsevier, 2018, 134 (SI), pp.395-398. ⟨10.1016/j.apradiso.2017.10.042⟩. ⟨cea-01803818⟩

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