Speaker
Description
In the present study, an overview of different reaction mechanisms
involved light and heavy ion induced reactions has been investigated at low
energies below 10 MeV/nucleon. In light ion reactions, an intermediate mechanism
so called pre-compound (PCN) emission which is bridging between compound
(CN) and direct reactions (DR) is attracted significantly due to its interplay between
nuclear structures and reaction dynamics. The current understanding of PCN
mechanism is advanced through cross-section measurements for a large number
of reactions produced in the interaction of protons[1] and alpha particles beams
with target nuclei (A=59−187). These experiments were carried out for a broad
mass range at the Variable Energy Cyclotron Centre (VECC), Kolkata, India [[1-6].
The conclusions of the present investigations have achieved three key milestones
since the development of PCN dynamics; (i) the development of mass-number
dependence systematics for target nuclei (A=59−187) [7], (ii) exploration of the
target deformation effects [8], and (iii) significance of the shell structure [8]. The
PCN process was further revolutionized by bombarding the heavy-ion beams (12C,
13C, 14N, 16O, 18O and 19F) on heavy mass target nuclei (A=150-181) using
accelerator facility of the Inter-University Accelerator Centre (IUAC), New Delhi.
Since, PCN emission process is scarce in heavy-ion (HI) reactions at low energy
due to the dominance of the breakup fusion (BUF) and fission process. In the
present work, how the contribution of PCN competes with BUF and fission
process, will be presented. Nevertheless, the evidence of PCN emission in HI
reactions at low energies (4–7 MeV/nucleon) highlights the crucial role of angular
momentum in these reactions [9-10]. To further explore these effects, experiments
were conducted at the IUAC, New Delhi to measure the recoil range distributions
(RRDs) and spin distributions (SDs) of production residues for various
projectile-target combinations. Analysis of the RRD and SD data revealed two
distinct de-excitation patterns corresponding to the pre-compound and compound
nucleus processes, providing valuable insights into the low-energy reaction
dynamics of heavy-ion collisions. Further details of these measurements and
analyses will be presented.
