Total cross sections for 4,6He + 28Si reactions measured at 10–28 MeV/A

Some peculiarities of interactions of weakly bound lithium nuclei at near-barrier energies

“…A significant excess of the experimental TCS values over σ R dependencies in Kox systematics is especially clearly pronounced for weakly bound 6 Hе nuclei [3] at energies near B c . The shape of the TCS energy dependence for ( 6 Hе+ 28 Si) differs significantly from the dependence for 4 He.…”

“…The experimental TCS values [2] increase with increasing energy of incident α-particles up to about 72 MeV, then a smooth decrease is observed. For 6 He ions at energies ranging from 110 to 230 MeV, the cross section σ R [3] is about 1200 mb, whereas in the energy range from 60 to 150 MeV (10-25 MeV/nucleon) a significant excess of the total cross section over TCS values calculated in Kox systematics is observed. Therefore we get a 'bump' or a bell-shaped form of the TCS curve with a maximum at 90 MeV (15 MeV/ nucleon) and a 200 mb excess of the cross section in the maximum as compared with the results of Kox systematics or at the 'bump' edges.…”

“…The experimental TCS values from our [3,12,17] and literature [1] works for [6][7][8][9] Li and 11 Li interactions with 28 Si nucleus in comparison with TCS values calculated using the semiempirical Kox formulas (3)- (7) and parameterization (8) for C(E) as a function of energy of incident particles are shown in figures 3-5.…”