6533b7cffe1ef96bd12583d1

RESEARCH PRODUCT

4He+Ni elastic scattering near the Coulomb barrier and optical model parameters

subject

description

Cross sections for the elastic scattering system of 4He+Ni have been investigated. Natural nickel was bombarded by 4He ions in the laboratory energy range of 3.0–14.3 MeV and the intensity of helium backscattering through laboratory angles of 96°, 117°, and 137° was observed. From measured yield data, the cross sections were extracted for the direct Ni(4He,4He)Ni scattering process as well as for the inverse recoil scattering process 4He(58Ni,4He)58Ni by calculating the kinematical reversal of the reaction. The experimental helium scattering angles convert to helium recoil angles of 20°, 30°, and 40°, and the incident helium ion energies to 43.5–207 MeV for incident 58Ni ions in the reversed reaction. Optical model parameters for helium elastic scattering were determined by using a measured scattering angular distribution at helium ion energy of 14.0 MeV and the energy distributions. These parameters were then used to calculate the elastic scattering of the 4He+Ni system for both the direct and reversed p...