Effects of 208Pb core vibrations on shell-model calculations for 211At and 211Pb

Abstract

The low-lying states of 211Pb and 211At are described as three j = 9 2 particles coupled to each other and to a 208Pb core. The core states are restricted to zero or one quadrupole-phonon excitations. All model parameters are determined uniquely from the available experimental data on nuclei having A = 208, 209, 210. The resulting wave functions and energy levels are given. Reduced transition probabilities for E2 transitions between the states of 211At are calculated and compared with experiment. Good agreement is achieved.