The sign of the multiple Coulomb excitation interference term and the static quadrupole moment of the first 2+ state of 114Cd

Abstract

A Coulomb excitation experiment has been performed on the first 2 + state of 114 Cd. Thin foils of enriched 114 CdO were bombarded by 50 MeV 32 S ions. The relative excitation probabilities of the first 2 + state were measured at backward and forward projectile scattering angles. Particle-γ coincidences were used to identify the inelastic events. The data were analyzed with the aid of the Winther-De Boer multiple Coulomb excitation program. The projectile and its bombarding energy were chosen to minimize the effect on the experiment of Coulomb excitation of the first 2 + state via the second 2 + state. By comparing the results of this work with the results of the high excitation probability experiment of Berant et al. , it was possible to deduce that the sign of the interference term due to Coulomb excitation of the first 2 + state via the second 2 + state is positive. The static quadrupole moment of the first 2 + state was determined to be Q 2 + = −0.35±0.07 b.