Isospin mixing in the decay of theT>giant dipole state

The magnitude of the isospin mixing in the decay of the $T_{>}$ giant dipole resonance has been estimated, using the ($\gamma$, n) and ($\gamma$,p) cross sections available for the medium-weight nuclei ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}$, ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}$, ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}$, ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$, and ${}_{}{}^{92}{}_{}{}^{}\mathrm{Mo}$. The deduced values show a fair correspondence with the existing data for mixing between compound states. From these results the mean mixing Coulomb matrix elements between compound states could also be derived.