A local nucleon-nucleon effective interaction based on current phenomenological nucleon-nucleon scattering amplitudes has been constructed at several bombarding energies between 50 and 1000MeV/nucleon within a dynamically nonrelativistic framework. The form of the interaction has been chosen for convenience in performing nucleon-nucleus scattering calculations in this energy range and for ease of comparison with one-boson-exchange potential models. Some properties of this interaction are compared with those of an earlier version based on an older set of nucleon-nucleon amplitudes.
We present a simple, exact numerical method of obtaining the complex, l-dependent potentials 4 U, fr) induced in the elastic channel by couphng to inelastic channels. For "0+'"Sm 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 exanune the "C +~C a 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 of4 U, 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 REACTIONSSm( 0 0'), E=72 MeV;~o Ca( BC,~SC'), E=68MeV; coupled channel analysis; deduced effective elastic optical potential.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.