SHELL-MODEL PICTURE OF VIRTUAL DETOUR TRANSITIONS IN CA-41 RADIATIVE ELECTRON-CAPTURE DECAY

For the first forbidden unique (1u) radiative electron-capture beta de cay of Ca-41, a contribution of the gamma/beta detour transitions via virtual nuclear states to the bremsstrahlung spectrum has been conside red in terms of the shell model. Calculations of the matrix elements f or the virtual El gamma and allowed Gamow-Teller beta transitions have been performed with the use of the Warburton, Becker, Millener, and B rown interactions. For the effective charge, which describes the contr ibution of the detour transitions, an interval 0.96<e(eff)<1 has been found. The model predictions are fairly close to the experimental valu e e(eff)=0.78. A possible origin of the small remaining deviation is d iscussed.