Coulomb excitation of ¹⁰²Ru

Coulomb excitation of ¹⁰²Ru was performed with beams of ¹²C and ¹⁶O ions at the Maier-Leibnitz Laboratory, with the scattered particles momentum analyzed using a Q3D magnetic spectrograph. Both the elastic and inelastically scattered particles were detected, and the resolution achieved enabled the populations of the 2₁⁺, 2₂⁺/4₁⁺ doublet, 2₃⁺, 2₄⁺/3₁^- doublet, and 3₂^- states to be determined as a function of the scattering angle, which were compared with GOSIA calculations. The deduced B(E2;2₁⁺→0₁⁺) = 41.5±2.3 W.u. is in good agreement with the ENSDF value of 44.7±0.7 W.u., while the B(E2;2₂⁺→0₁⁺ ) = 1.75±0.11 W.u. is approximately 40% larger than the ENSDF value.The weakly populated 2₃⁺ state was observed for a single angle only, and a fit to its population results in B(E2; 2₃⁺→0₁⁺ ) = 0.053±0.011 W.u. Using the known γ-ray branching ratios, the B(E2; 2₃⁺→0₂⁺) value is calculated to be 18±4 W.u., substantially less than the B(E2; 2₁⁺→0₁⁺) value, suggesting that the deformation of the 0₂⁺ state is less than that of the ground state. The results are compared with beyond-mean-field calculations with the Gogny-D1S interaction using the symmetry-conserving configuration-mixing method, and placed in context of the systematics for Ru isotopes.