Abstract
Differential cross sections for 87Sr(d, 3He) 86Rb and 88Sr(d, 3He) 87Rb were measured with the Princeton 27.9 MeV deuteron beam and the quadrupole-dipole-dipole-dipole (QDDD) spectrograph. States of 86Rb and 87Rb up to 1.74 MeV and 1.58 MeV, respectively, were studied with a total resolution of 16keV. Zero-range distorted-wave Born approximation (DWBA) calculations were used to determine l transfers and spectroscopic strengths. If the targets are described as a closed shell for 88Sr and as (v g 9 2 ) −1 for 87Sr, only the 88Sr(d, 3He) 87Rb spectroscopic strengths are close to shell model expectations. The observed 87Sr(d, 3He) 86Rb strengths fall 25% below the shell model sum rule. Hence the data suggest that the proton wave functions of 87Sr contain appreciably more configuration mixing than those of 88Sr. Values for the (πf 5 2 , v g 9 2 ) residual interaction matrix elements are proposed, but must remain tentative until the shortfall of f 5 2 strength is understood.
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