Coulomb and nuclear inelastic excitations and the optical potential for heavy ions

M. A. Franey and P. J. Ellis
Phys. Rev. C 23, 787 – Published 1 February 1981
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Abstract

We present a simple, exact numerical method of obtaining the complex, l-dependent potentials ΔUl(r) induced in the elastic channel by coupling to inelastic channels. For O16 + Sm152 at 72 MeV, we consider pure Coulomb coupling and find that a simple power law absorption or the imaginary l-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 C13 + Ca40 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 ΔUl 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 Sm152 (O16, O16), E=72 MeV; Ca40(C13, C13), E=68 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

Authors & Affiliations

M. A. Franey and P. J. Ellis

  • School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455

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Vol. 23, Iss. 2 — February 1981

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