Negative parity states in 195Au

The nuclear structure and the properties of the low lying levels of negative parity in Au195 are investigated in the frame work of the intermediate coupling approach of the unified model. It is assumed that the last odd proton has available the h 11/2 state and is coupled to the collective surface vibrations of the doubly even core. The Hamiltonian of the coupled system including all the states upto two phonons of quadrupole vibrations is diagonalized. The coupling parameter xi is varied from 3 to 8. The levels obtained are compared with the experimental energy levels of spin 7/2-, 9/2-, 15/2- and 11/2-. The negative parity states are reproduced satisfactorily by the model. The wave functions derived from the best fit are used to calculate the transition probabilities. From the available experimental conversion coefficients of several transitions occurring among the negative parity states, mixing ratios are deduced. Using the theoretical T(E2) and T(M1) and mixing ratios, branching ratios are calculated and compared with the experimental values. (K.B.)