The ( 12C, 8Be) reaction on 12C, 16O, 24,26Mg, 40,48Ca, 54Fe AND 58Ni between 50 and 65 MeV bombarding energy

Abstract

Absolute cross sections have been measured for the ( 12C, 8Be g.s.) reaction from the target nuclei 12C, 16O, 24Mg, 26Mg, 40Ca, 48Ca, 54Fe and 58Ni at various energies between 50 and 65 MeV bombarding energy (lab) using a highly efficient detection system for 8Be. The results are presented in form of particle spectra and angular distributions. Except for the lightest target nuclei 12C and 16O, the cross sections decrease rapidly with angle and a one-step direct reaction mechanism is indicated. Satisfactory agreement of the data is obtained with DWBA calculations, using the finite range computer code LOLA of DeVries which treats recoil effects exactly. The spectroscopic factors extracted for the ( 12C, 8Be) reaction are close to those obtained from ( 6Li, d), ( 7Li, t) and ( 16O, 12C) reactions. The selective excitation of the same final states in all of these reactions, as far as data are available, and the close agreement of the spectroscopic factors are interpreted as evidence for a rather simple α-transfer in these reactions in contrast to a more complicated transfer of four nucleons.