States ofRb86: TheSr88(d,α)Rb86Reaction

The ${}_{}{}^{88}{}_{}{}^{}\mathrm{Sr}(d,\alpha ){}_{}{}^{86}{}_{}{}^{}\mathrm{Rb}$ reaction has been studied with 17.00-MeV deuterons. Energy resolution of 11 keV was obtained using an Enge split-pole spectrograph. Accurate excitation energies (±0.15%) were measured for more than 35 states up to an excitation energy of 3.3 MeV in the residual nucleus. Differential cross sections were obtained for most of the ${}_{}{}^{86}{}_{}{}^{}\mathrm{Rb}$ states for $12.5°\le \theta \le 65°$, and compared with distorted-wave calculations. The deduced $L$-transfer values allowed the assignment of a narrow range of $J^{\pi }$ values to 25 of these states. Several unique spin assignments were possible. Microscopic-model calculations were performed for several of the low-lying negative parity states in ${}_{}{}^{86}{}_{}{}^{}\mathrm{Rb}$, using simple two-component wave functions empirically derived from ${}_{}{}^{87}{}_{}{}^{}\mathrm{Rb}\mathrm{}(d,t)\mathrm{}$ spectroscopic factors. The predictions agreed reasonably well with the experimental ($d,\alpha$) data for both the relative magnitudes and the shapes of the angular distributions, except for the $J^{\pi }=2^{-}$ ground state.