Breakup Mechanism Features in the ²⁷A1(¹⁴N,X) Reaction at Bombarding Energies up to 116 Mev

Abstract

Previous work on reaction mechanisms in light nuclear systems, in the energy range 4–10 MeV/n, suggested that a significant contribution to the nonfusion cross—section could be related to the deep inelastic collisions ^1–3. One of the basic assumption concerning the deep inelastic process is the two-body character of the interaction ⁴. However recently it was shown, that three-body final state processes turned out to be important at bombarding energies close to 125 MeV for the ²⁷Al(¹⁶0,X) reaction ⁵. It was concluded on the basis of kinematic considerations, together with analysis of the inclusive energy spectra of reaction products, that the mechanism responsible for interaction is the direct breakup process⁵. In the present lecture,an evidence for three-body final state breakup, in the reaction ²⁷Al(¹⁴N,X) at 116 MeV bombarding energy ^10a is presented. Data at lower energy (55 MeV) are consistent on the other, side with a two-body final state breakup confirming the previous results⁹,measured at 62 MeV. It follows from these data that there is a transition with the rising energy from two-body to three-body final state in the considered reaction.The breakup process is a direct mechanism differing essentially from a deep inelastic process which is a delayed mechanism, favoring thedissipation of energy up to a full relaxation.