Abstract
We study the influence of Coulomb-induced isospin-mixing on the superallowed Fermi β decay using the complex EXCITED VAMPIR variational approach for the description of the lowest excited 0 + states in the two isovector triplets of nuclei 70Se, 70Br, 70Kr and 74Kr, 74Rb, 74Sr, respectively. As expected, the effects are small but nevertheless non-negligible. The calculated strength for the 74Rb → 74Kr Fermi β decay to the first excited 0 + state turns out to be very weak, in agreement with the experimentally given upper limit. However, particular non-analog Fermi branches to excited 0 + states with considerable strength are predicted to coexist with the superallowed decay in some of the presently investigated nuclei. This may give some hope for possible experimental detection.
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