Coulomb Excitation of Levels inPd105

The low-lying excited states of ${\mathrm{Pd}}^{105}$ were investigated by means of Coulomb excitation using 4.4-8.0-MeV $\alpha$-particle projectiles. The $\gamma$-ray spectrum resulting from the deexcitation of these levels was recorded at each bombarding energy with the aid of a large-volume high-resolution Ge(Li) detector. Thirteen transitions were observed that result from direct $E2\mathrm{}$ excitation of 10 excited states up to an excitation energy of 782 keV. The $B\left(E2\mathrm{}\uparrow \right)$ values from the ground state to each of these 10 levels was determined. Several $E2\mathrm{}$ transitions were found to be strongly enhanced over estimates of single-particle speed, a pattern suggestive of collective behavior. The measured $B\left(E2\mathrm{}\right)\mathrm{}$ values, together with some inferred $M1\mathrm{}$ transition speeds, are compared with predictions of a weak-coupling core-excitation model.