Interaction of α-particles with α-cluster nuclei (126C and 168O) in aspect of optical potential model

Supplementing the usual optical model potential by a repulsive term Vc allows to model Anomalous Large Angle Scattering (ALAS) in the α-particle scattering. The projectile energies used are below 10 MeV in the laboratory system ensuring only a small number of reaction channels to be opened allowing for the use of completely real interaction. The α particles on 12C at projectile energies from 2.80 to 9,33 MeV and 19.00 MeV on 16O at projectile energies from 5.20 to 7.50 and 30.00 MeV where a remarkable ALAS phenomena appeared are analyzed. An analytical Soliton Form Factor is used for Vc that could be interpreted as a storage for kinetic energy in compressed nuclear matter. Angular distributions of 12C and 16O nuclei are calculated with the optical model potential with a repulsive core. Angular distributions calculated and experimental ones are in good agreement supporting such parametrization and compressibility moduli values obtained for the two systems α+12C and α+16O. The approach discussed is very useful tool for the analysis of the experimental data involving the elastic interaction of α particles. Its novel feature is that it determines fairly accurately the compressibility modulus of nuclear matter. 8 figs., 3 tabs., 21 refs.(orig.)