Charge-exchange reaction on 12C with 217 MeV 3He particles

Abstract

Differential cross sections for the ( 3 He, t) charge-exchange reaction have been measured on a 12 C target with 217 MeV 3 He particles. High energy tritons were detected using a thick Ge(Li) crystal (43 mm) and a 4 mm Si(Li) detector in an E - ΔE telescope. Microscopic DWBA calculations have been carried out, using the rather well known wave functions of the 12 C levels from Gillet and Vinh-Mau. The sensitivity of this reaction to the different terms of the two-body effective interaction is discussed. A comparison of the ( 3 He, t) and ( 3 He, 3 He') reactions populating analog final states is also presented. The two-step mechanisms ( 3 He,α)(α, t) and ( 3 He, d)(d, t) are introduced for the first two levels 1 + (g.s.) and 2 + (0.969 MeV) and the results emphasize the importance of such processes at high energy.