The optical potential of 6He in the eikonal approximation
Abstract The new data of the elastic scattering of 6 He+ 12 C at about 40 MeV/nucleon are analyzed in the eikonal approximation. The 6 He+ 12 C phase-shift function is evaluated completely without any ad hoc assumption by a Monte Carlo integration, which makes it possible to use a realistic 6-nucleon wave function for a halo nucleus 6 He. The effect of the breakup of 6 He on the elastic differential cross sections as well as the optical potential is studied at different energies from 40 to 800 MeV/nucleon.
166 MeV elastic and inelastic alpha-particle scattering; macroscopic and microscopic analysis
Abstract Alpha-particle elastic scattering on 12 C, 28 Si, Sn, Pb and 2 H has been studied in order to obtain optical potential parameters. For each nucleus we find only one potential that gives a good fit, the situation being rather different from that existing at smaller energies. The first 2 + levels of C, Si and Sn and the first 3 − level of C were observed and the angular distribution of scattered α-particles analysed using the DWBA. Comparison has been made between theoretical and experimental deformation parameters. Optical potentials were calculated with an effective αN interaction and a matter distribution of the Fermi, shell-model or Hartree-Fock type. The agreement with elastic scattering results is very good. Differential cross sections for inelastic scattering obtained using these optical potentials and the same effective αN interaction in the DWBA matrix elements are compared with the experimental ones.
Elastic scattering of 104 MeV alpha particles
Abstract The differential cross sections for the elastic scattering of 104 MeV α particles from nine target nuclei were measured. All angular distributions show a pronounced diffraction pattern. For the lightest nuclei measured ( 6 Li to 16 O) the cross section exceeds the Rutherford cross section by a factor up to 10 at angles around 30°.