Complex fragment emission in low energy light-ion reactions

TL;DR

This study measures complex fragment emission in low-energy light-ion reactions, analyzing energy spectra, reaction mechanisms, and angular momentum dissipation to understand fusion-fission and deep inelastic processes.

Contribution

It provides experimental data on fragment spectra and reaction dynamics, confirming statistical model predictions and estimating time scales and angular momentum dissipation in these reactions.

Findings

Yields of fully energy damped fragments match statistical model predictions.

Time scales of deep inelastic emissions were extracted from angular distributions.

Angular momentum dissipation approaches the sticking limit value.

Abstract

Inclusive energy spectra of the complex fragments (3 $\leq$ Z $\leq$ 5) emitted in the reactions $^{12}$C (77 MeV)+ $^{28}$Si, $^{11}$B (64 MeV)+ $^{28}$Si and $^{12}$C (73 MeV)+ $^{27}$Al (all having the same excitation energy of $ \sim$ 67 MeV), have been measured in the angular range of 10$^\circ$ $\lesssim \theta_{lab} \lesssim$ 60$^\circ$. The fully energy damped (fusion-fission) and the partially energy damped (deep inelastic) components of the fragment energy spectra have been extracted. It has been found that the yields of the fully energy damped fragments for all the above reactions are in conformity with the respective statistical model predictions. The time scales of various deep inelastic fragment emissions have been extracted from the angular distribution data. The angular momentum dissipation in deep inelastic collisions has been estimated from the data and it has been found to be close to the corresponding sticking limit value.