Elsevier

Nuclear Physics A

Volume 327, Issue 1, 17 September 1979, Pages 221-249
Nuclear Physics A

Long range absorption and other optical-model effects from strong inelastic coupling

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Abstract

An optical potential component is constructed to represent the effect of a strongly coupled inelastic excitation upon elastic scattering. In the particular case of quadrupole Coulomb excitation a long range imaginary potential component is derived in closed form. The effects of long range absorption upon the elastic scattering are considered in a general way by inserting this potential into a weak absorption model and deriving an elastic scattering cross section in closed form. Below the Coulomb barrier the formula takes a simple form which may be related to the semiclassical theory of Coulomb excitation. The potential component arising from nuclear excitation of an inelastic state may be evaluated numerically on a computer. Two examples computed (50 MeV α-scattering on 154Sm and 60 MeV 16O scattering on 40Ca) exhibit strong l-dependence in the potential component.

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†

Research supported by the US Department of Energy, under Contract No. EY-76-C-02-0016.

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