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Consistent calculation of the screening and exchange effects in allowed β − transitions

Xavier Mougeot 1 Charlène Bisch 1
1 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : The atomic exchange effect has previously been demonstrated to have a great influence at low energy on the 241Pu β− transition. The screening effect has been given as a possible explanation for a remaining discrepancy. Improved calculations have been made to consistently evaluate these two atomic effects, compared here to the recent high-precision measurements of 241Pu and 63Ni β spectra. In this paper a screening correction has been defined to account for the spatial extension of the electron wave functions. Excellent overall agreement of about 1% from 500 eV to the end-point energy has been obtained for both β spectra, which demonstrates that a rather simple β decay model for allowed transitions, including atomic effects within an independent-particle model, is sufficient to describe well the current most precise measurements.
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Submitted on : Tuesday, July 24, 2018 - 12:17:13 PM
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Xavier Mougeot, Charlène Bisch. Consistent calculation of the screening and exchange effects in allowed β − transitions. Physical Review A, American Physical Society, 2014, 90 (1), pp.012501(8). ⟨10.1103/PhysRevA.90.012501⟩. ⟨cea-01848119⟩



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