High-energy \gamma -ray spectra from statistical decay of the Giant Dipole Resonance in 60Zn and 61Zn nuclei were measured and analysed. The GDR parameters and the isospin mixing probability for 60Zn at around 50 MeV excitation energy were deduced from both experiments. This result and the previous results obtained for 32S, 36Ar, 44Ti nuclei allowed to establish the dependence of the isospin mixing on the atomic number Z.
PACS numbers: 24.30.Cz, 25.70.--z, 23.20.--g
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