Abstract
We present a simple, exact numerical method of obtaining the complex, -dependent potentials induced in the elastic channel by coupling to inelastic channels. For + at 72 MeV, we consider pure Coulomb coupling and find that a simple power law absorption or the imaginary -dependent polarization potentials of Baltz et al. gives good agreement with coupled channel cross sections out to 100°. For larger angles a more accurate representation of the polarization potentials for the low partial waves is required, both real and imaginary parts being significant. We also examine the + system at 68 MeV including a number of excited levels in both projectile and target. Here, nuclear coupling is dominant. The strength of the imaginary part of is found to vary quadratically with deformation length and inversely with excitation energy for excitations above about 5 MeV. The states above 8 MeV lead to a real potential of strength comparable to the imaginary in the surface region. The effect on the cross sections is discussed.
NUCLEAR REACTIONS (, ), MeV; (, ), MeV; coupled channel analysis; deduced effective elastic optical potential.
- Received 11 August 1980
DOI:https://doi.org/10.1103/PhysRevC.23.787
©1981 American Physical Society