Electric quadrupole polarization charges in proton drip line nuclei

Core polarization charges of quadrupole transitions in proton drip line nuclei, 50100Sn50 and 2848Ni20, are estimated, using the Hartree-Fock calculations with Skyrme interactions and the RPA solved in the coordinate space with the Greenʹs function method. The polarization charges of the two nuclei are larger than those of ℓ-s closed shell nuclei and receive the major contributions from both the lowest-lying 2+ state and the giant resonances. The E2 polarization charge estimated for 50100Sn50 is consistent with the available empirical information obtained from the shell model analysis of the data on 4899Cd51, though the estimated epol(E2) values depend appreciably on Skyrme interactions used.