Abstract
A study has been made of the six most pronounced isobaric analog resonances in the 88Sr(p, p') 88Sr (3 −) excitation function at E p = 7.65, 7.80, 7.92, 8.78, 9.75, and 9.90 MeV. They are believed to have a simple structure in the parent nucleus 89Sr consisting of the lowlying positive-parity, single-neutron spectrum of 89Sr weakly coupled to the collective 3 − state in 88Sr. A high-resolution 88Sr(d, p) 89Sr experiment was performed to locate small 2f and 3p admixed fragments in 89Sr which would allow these analog resonances their entrance widths. In addition, on-resonance 88Sr(p, p') 88Sr (3 −) angular distributions were measured in order to determine the partial waves involved in the exit channel. Results are compared to a particlephonon coupling model, and overall selectivity, strengths, and angular distributions of the (p, p') analog resonances are consistent with the above interpretation.
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