Gross-Structure resonances previously observed only in inclusive measurements have been studied in both single and mutual inelastic scattering involving the O2" state of ^^O. Analysis of the excitation functions in the single-excitation channel at the zeros of Legendre polynomials permits the dominant L values to be determined for most of the resonances. The measured spins disagree with the predictions of a recently published microscopic model of the inelastic-scattering process.
Excitation functions for the total cross section in various mutual excitation channels have been measured in the ' 0 + ' 0 system using a y-y coincidence technique in the energy range E, = 24 -41 MeV. The inclusive cross section for the production of 6.13MeV y rays has also been measured using a Ge(Li) detector. Gross structure oscillations are seen in the mutual excitation of the second excited (J = 3 ) state; these oscillations are approximately in phase with those of the single excitation cross section, which has also been extracted from the present data using the combined results of coincidence and singles measurements.The general trend of the data is accounted for by recently published coupled channels calculations, although a detailed fit is not achieved. NUCLEAR REACTIONS ' 0(' 0' 0*)' 0* E, = 24 -41 MeV; measured y-y coincidences; deduced reaction mechanism.
Intermediate width resonance-like structures in the ' C+'~0 system have been studied via inelastic scattering to the 'so(02+) state. The dominant partial waves contributing to several structures have been determined by analysis of excitation functions at zeros of Legendre polynomials.The results disagree vrith spins extracted from angular correlation measurements in non-spin-zero channels.Measurement of the spins of proposed intermediate width structure resonances in elastic and inelastic-scattering channels has proven to be one of the most challenging problems in the study of heavy ion scattering at energies up to a few times the Coulomb barrier. Since competing dynamical models often differ on the angular momenta of the resonating amplitudes (for example, because of different couplings between elastic and inelastic channels), a reliable determination of resonance spins is necessary for discriminating among such models and/or for determining the parameters characterizing a given model. On a more basic level, the ability to characterize each structure in
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