Evidence for the Exchange Effect Down to Very Low Energy in the Beta Decays of 63Ni and 241Pu

M. Loidl 1, * C. Le-Bret 1 M. Rodrigues 1 X. Mougeot 1
* Corresponding author
1 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : Metallic magnetic calorimeters have been used for several years for the determination of the shapes of beta spectra. Experimental spectra of the beta decays of 63Ni and 241Pu exhibit, at very low energy, strong deviations from standard theoretical calculations including corrections for screening, radiative, and nuclear size effects. These discrepancies can be attributed to the atomic exchange effect. In particular the spectrum of 63Ni measured with an electroplated 63Ni source is in excellent agreement with theory including the exchange effect. This underlines the quality of the experimental spectrum as well as the correctness of the calculation of the exchange effect.
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https://hal-cea.archives-ouvertes.fr/cea-01834215
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Submitted on : Tuesday, July 10, 2018 - 12:39:18 PM
Last modification on : Wednesday, September 4, 2019 - 1:40:15 PM

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M. Loidl, C. Le-Bret, M. Rodrigues, X. Mougeot. Evidence for the Exchange Effect Down to Very Low Energy in the Beta Decays of 63Ni and 241Pu. Journal of Low Temperature Physics, Springer Verlag (Germany), 2014, 176, pp.1040 - 1045. ⟨10.1007/s10909-014-1190-9⟩. ⟨cea-01834215⟩

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