Abstract
In terms of diagrams the essential contribution to the self-energy, which is due to a pick-up reaction, comes from the particle-particle ladder. This ladder contribution is calculated in an approximative way. An absorptive part of the optical potential is obtained which acts essentially as a surface absorptive. For each partial wave of the elastic channel it is a finite sum of separable terms. A strong angular momentum dependence of the imaginary part of the potential at pick-up threshold is found. This dependence is governed by the angular momentum of the bound orbitals, from which pick-up occurs.
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