Neutron pickup strength in sup 87 Sr from the ( rvec p , d ) reaction

Differential cross section and analyzing power angular distributions have been obtained for the {sup 87}Sr({ital {rvec p}},{ital d}){sup 86}Sr reaction in two measurements using different magnetic spectrometers at incident proton energies of 94.2 and 91.8 MeV. Typical energy resolutions of 70 and 40 keV, respectively, were achieved. Optical-model parameters were obtained by fitting the elastic scattering data measured to laboratory angles of 90{degree} for protons at 94.2 MeV and to 120{degree} for deuterons at 88.0 MeV. Standard exact finite range distorted-wave Born approximation calculations using these optical-model parameters failed to describe the experimental data, while the adiabatic approximation improved the description to some extent. Orbital and total angular momenta, {ital l} and {ital j}, of the picked-up neutron were extracted from the angular distributions of the differential cross section and analyzing power for all the residual states observed. The rms radius of the 1{ital g}{sub 9/2} neutron orbital, obtained from magnetic electron scattering, was used in the extraction of strength for this orbital, while rms radii from Hartree-Fock calculations were used for the 2{ital p}{sub 1/2}, 2{ital p}{sub 3/2}, 1{ital f}{sub 5/2}, and 1{ital f}{sub 7/2} orbitals. The observed 1{ital g}{sub 9/2} strength, spread over 20 states up to 5.4-MeVmore » excitation, indicates a depletion of about 43% compared to simple shell-model expectations. Similarly, the observed 1{ital f}{sub 5/2} strength, spread over 17 states, indicates a depletion of about 32%. The weighted summed spectroscopic strength for the 1{ital g}{sub 9/2} orbital, deduced from the present study, is lower than that obtained from magnetic electron scattering.« less