Analyse der elastischen Streuung von Deuteronen an ¹²C nach dem optischen modell im energiebereich von 10.6 MeV bis 13.9 MeV

Abstract

Optical-model analyses on ¹²C(d, d) elastic scattering data at eight energies from 10.6 to 13.9 MeV have been performed using a potential without spin-orbit interaction but including volume and surface absorption. The computing program varies two parameters, the real and imaginary potential depths. At each deuteron energy more than one set of parameters was obtained, leading to minimum values of the error function ξ², one of them being reasonable according to energy-dependence and magnitude of the parameter values. Using only this set as initial values in the fitting procedure and fixing the other input parameters to optimum but constant values, the best fits were obtained with equal strength of volume and surface absorption Theoretical and experimental angular distributions are in satisfactory agreement in the angular range up to 120°. At greater angles they disagree due to a deep minimum of the theoretical cross section at 150°, which is responsible for the magnitude of the ξ² values. This minimum may, perhaps, be filled by use of the spin-orbit interaction in the optical potential. Optimum potentials do not strongly depend on energy. The energy dependence of the real potential can be expressed with an interpolation formula similar to that given by Zeidman, Yntema and Satchler (ref. ¹²)).