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- W4320486098 abstract "We investigate the exchange effect between the final atom's bound electrons and those emitted in the allowed $ensuremath{beta}$ decay of the initial nucleus. The electron wave functions are obtained with the Dirac-Hartree-Fock-Slater self-consistent method, and we ensure the orthogonality between the continuum and bound electron states, in the potential of the final atom, by modifying the last iteration of the self-consistent method. We show that orthogonality plays an essential role in calculating the exchange correction. After imposing the orthogonality, we found considerable differences in magnitude and energy dependence compared to previous results. We argue that our findings can solve the mismatch between the previous predictions and experimental measurements in the low-energy region of the $ensuremath{beta}$ spectrum. First, we calculate the exchange effect for the low-energy $ensuremath{beta}$ transitions in $^{14}mathrm{C}$, $^{45}mathrm{Ca}$, $^{63}mathrm{Ni}$, and $^{241}mathrm{Pu}$, recently investigated in the literature. Next, we compute the total exchange correction for a large number of $ensuremath{beta}$ emitters with $Z$ from 1 to 102. From the systematic study, we found that for ultralow energy, i.e., 5 eV, the $Z$ dependence of the total exchange effect is affected by ${s}_{1/2}$ and ${p}_{1/2}$ orbitals closure. We also show that the contributions from orbitals higher than the $2{s}_{1/2}$ orbital are essential for correctly calculating the total effect, especially for low energies and heavy $ensuremath{beta}$ emitters. Finally, we provide an analytical expression of the total exchange correction for each atomic number for easy implementation in experimental investigations." @default.
- W4320486098 created "2023-02-14" @default.
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- W4320486098 date "2023-02-13" @default.
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- W4320486098 title "Exchange correction for allowed <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>β</mml:mi></mml:math> decay" @default.
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- W4320486098 doi "https://doi.org/10.1103/physrevc.107.025501" @default.
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