Configuration-mixed alpha-decay rate calculation for the decays of the 1- and 9- states in 212At

A calculation of the relative alpha-decay rate for the decays of the 1- and 9- states in 212At to states in 208Bi has been performed. As unperturbed states of 212At the authors take the product states of the three-proton nucleus 211At and the one-neutron nucleus 209Pb, the energies and wave functions for the states of these nuclei being obtained from earlier analyses. The mixture is determined by diagonalizing the Kuo-Herling interaction. Using this mixture in the alpha decay calculation an improved agreement is achieved with experiment. In particular this is true for the decay to states with πhsub(9/2)γfsub(5/2)-1 as main component, whereas the result for the decays to states with main component πhsub(9/2)γsub(1/2)-1 is less satisfactory. (Auth.)