Reaction channel contributions to proton scattering at 65 MeV

Abstract

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Reaction channel contributions to the proton +Pb208 optical potential at 40 MeV

“…Many important and interesting cases of DPPs arising from coupling to multiple states have been studied, Refs. [2,5,[10][11][12][13] and earlier work cited therein. Establishing the DPP due to the simultaneous pickup of the six states of 208 Pb proves challenging.…”

“…See Refs. [2,5,[10][11][12][13] for applications of this 'CC-inversion' procedure to much lighter target nuclei than in the present case. For nucleon scattering from the lighter nuclei the balance between inelastic processes and transfer contributions turns out to be substantially different to what we find for the heavy closed shell nucleus 208 Pb.…”

“…Unlike the cases for lighter target nuclei, Refs. [2,5,[10][11][12][13], for protons on the doubly closed shell 208 Pb the contribution of inelastic scattering, at least to lower lying collective states, turns out to be very small and inelastic coupling is not included in the present work.…”

“…The state CS is not necessarily equal to the change in reaction cross section (CS) and the relationship between the two can vary widely, Refs. [2,14,15], depending on the particular case. In cases where inelastic coupling is included together with reaction channel coupling [2,14,15], the relation between (CS) and State CS is quite different for pickup and inelastic collective coupling.…”

“…This influence cannot be represented in theories based on local density models; couplings to these channels induce contributions that cannot be represented by uniform renormalization of potentials based on such models. In previous works we have shown that for protons scattering from nuclei as heavy as 48 Ca [2] coupling to neutron pickup channels (outgoing deuterons) can be particularly important. In the present work we extend these studies to the heavy target 208 Pb which gives access to a large number of strongly populated pickup channels having a wider range of angular momentum transfers than in previous work.…”