Electric polarizability of nuclei and a longitudinal sum rule

Abstract

Recently, a longitudinal sum rule for the electric polarizability of nuclei was used to revise a relativistic correction in a dipole sum rule for the polarizability (nucl-th/9802011). This revision is shown to be wrong because of neglecting an asymptotic contribution in the underlying dispersion relation. The status and correct use of the longitudinal sum rule is clarified.

Comments: 9 pages, revtex, minor clarifications added. To appear in Nucl. Phys. A