NUCLEAR-CHARGE RADII AND ELECTRIC QUADRUPOLE-MOMENTS OF EVEN-EVEN ISOTOPES

Isotope shifts of the charge mean-square radii and electric quadrupole moments of even-even nuclei with 20 less than or equal to Z less than or equal to 98 are calculated using a dynamical microscopic model. A single-particle Nilsson potential with the Seo set of correction terms, pairing forces in the BCS formalism, and a long-range interaction in the local approximation are used. A collective Hamiltonian is obtained using a generator coordinate method with the Gaussian overlap approximation. The potential energy of the nucleus consists of a microscopic-macroscopic Strutinsky energy and a zero-point vibrational term. A liquid droplet model is used for the macroscopic part of the potential. A BCS wave function is taken as a generator function, and two collective variables, quadrupole and hexadecapole deformations, serve as the generator coordinates. In general, good agreement between the theory and experimental data is achieved. (C) 1995 Academic Press, Inc.