Total Cross Section for [sup 4,6]He+[sup 28]Si Reactions at 10–28 MeV/A.

New results on the energy dependence of the total cross section (σ[sub R]) for [sup 6]He scattering on [sup 28]Si in the incident energy range 10-28 MeV/A are obtained. The α-particle-production cross sections for the [sup 28]Si([sup 6]He, [sup 4]He)X channel are measured as well. The secondary beam of [sup 6]He with an intensity of up to 5 x 10[sup 4] particle/s was generated by bombarding a thick beryllium target with ∼32-MeV/A [sup 7]Li ions. In the energy region below 17 MeV/A, σ[sub R] increases sharply. The experimental dependences of the total cross sections are compared with the results of σ[sub R] calculations using the double-folding potential within the optical model. The energy dependence of σ[sub R] for [sup 6]He differs from that for the neighboring nuclei, which can be associated with the structural features of the former nucleus. The energy spectra of α particles produced in the [sup 6]He interactions with silicon indicate two mechanisms of their production: transfer reaction and [sup 6]He breakup in the field of the [sup 28]Si nucleus. [ABSTRACT FROM AUTHOR]