A comparative study of the properties of pocket and barrier resonances is carried out using finite-range potentials having a pocket and a barrier. Comparison is made between the s-wave potential barrier region resonances with an absorptive pocket, and the corresponding resonances of a potential barrier without an absorptive pocket. We numerically study the resonance states generated by the finite-range truncated parabolic barrier. In this case the location of resonances in the vicinity of the barrier are approximately equispaced, but deviation from this feature occurs for resonances farther away from the barrier top. Using these results as a basis we empirically analyse the resonances in the 16O+16O system within the broad framework of the barrier region resonance model.
Using an explicit analytical expression of the s-wave S matrix for a typical short-range potential barrier we correlate the classical orbiting and corresponding quantum-mechanical barrier states. These are compared with the results of earlier works on this problem and some additional interesting features, such as dependence of width on height of the barrier and spacing between the levels of the barrier region resonances, are pointed out. On this basis, a four-parameter barrier region resonance model is introduced in the analysis of resonances in heavy ion scattering. The model is then applied to fit satisfactorily the large number of resonances observed in ' C+ ' C and ' C+ ' 0 systems. The present model directly relates the nucleus-nucleus potential barrier generated by the effective nucleus-nucleus potential to heavy ion resonances.
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