Unique shape dependence in the coherent influence of signature on energies andM1rates

The relation between the signature splitting of energies and the signature dependence of M1 transition matrix elements is investigated in connection with the deviation of nuclear shape from axial symmetry. The analysis of available experimental data on the signature dependences as well as the sign of E2/M1 mixing ratio of the \ensuremath{\Delta}I=1 transition confirms our understanding of the structure of the rotational perturbation.