Global dependence of optical potentials for α-particles with energies up to 80 MeV

In order to construct a global dependence (its energy components) of optical potential (OP) parameters for α-particles with an energy lower than 80 MeV the analysis of 12 experimental differential cross section angular distribution (DSAD) of elastic scattering in an energies range from 21 up to 80 MeV on the 90Zr nuclei was carried out. The unity of approach (and possibility of join of results) is observed at construction of global dependence in an energy range up to and above 80 MeV. In the range of energies up to 80 MeV the mass dependence of OP parameters is investigated for α-particles with the energy ∼50 MeV on the nuclei 12C, 24Mg, 28Si, 48,50Ti, 56Fe, 58Ni, 68,70Zn, 90,94Zr, 120,124Sn on the basis of the data obtained on isochronous cyclotron of Institute of Nuclear Physics (Kazakhstan). The data on elastic α-particle scattering are analyzed using deformed OP model by employing the code SPI-GENOA. The optimum OP parameters were searched so that to achieve the best agreement within the framework of the joint analysis DSAD of scattering and available data on total cross section, describing of 'transparency effect' for the nuclear with A=90, and also tendency of a values change of a volume integral from a real part. As a whole, within the framework of the microscopic approach the good describing of differential and total cross sections on the investigate nucleus is obtained. In the semimicroscopic approach the energy dependence of a real part of α-particle OP is studied. In a density functional method the effective nucleon-nucleon forces, proton and neutron densities of the colliding nuclei are taken into account. Is concluded that the obvious account of exchange of nucleon-nucleon correlation is important for understanding of energy dependence of α-particle scattering of low and middle energies on the nucleus. As a whole, within the framework of microscopic and semimicroscopic approaches a good describing of differential and cross sections on investigated nucleus is obtained