Abstract
Using beams of20Ne at 291 and 392 MeV and12C at 300 MeV the inelastic excitation of collective modes in58Ni has been studied with a Q3D magnetic spectrometer. In the analysis different contributions are unfolded from the spectra:1. single lines,2. the inelastic continuum,3. the three-body continuum, which mainly originates from one-nucleon pick-up to unbound states followed by the nucleon emission. Special care was taken to calculate the spectral shape and strength of this process. The population of unbound21Ne-states is measured in a neutron-20Ne coincidence experiment. Coupled channel calculations have been performed to extract the deformation parameters for the inelastic states, including mutual excitation. For the giant quadrupole resonance 70 % of the energy weighted sum rule is found. The excitation of higher multipoles is calculated and extrapolated to higher incident energies (50 MeV/u). The importance of the in-elastic excitation as a “doorway process” to more complex interactions is discussed. It is found that especially the excitation of the projectile (20Ne) takes a large fraction (20–50 %) of the incoming flux in the first step.
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Deceased 29.09.82
The authors are grateful to Dr. D. Hilscher, Dr. E. Holub, Dr. Jahnke and Dr. H. Rossner to make the equipment at the neutron scattering chamber available and for their help to perform the neutron coincidence experiment.
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Bohlen, H.G., Ossenbrink, H., Lettau, H. et al. Inelastic scattering of20Ne and12C on58Ni and the three-body continuum. Z Physik A 320, 237–251 (1985). https://doi.org/10.1007/BF01881271
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DOI: https://doi.org/10.1007/BF01881271