Analysis of intermediate and light mass fragments from composite systems 26–29Al⁎ formed in [formula omitted] reactions

Abstract

A comparative analysis of intermediate mass fragments (IMFs) and light particles (LPs) [equivalently, evaporation residues (ERs)] in the decay of 26,27,28,29Al⁎ has been carried out for reactions O16+10,11B and O18+10,11B at the energy range 1 MeV≤E/A≤4 MeV, within dynamical cluster decay model (DCM) of collective clusterisation approach. We find that, for IMFs having Z=3,4,5 and 6, the range of mass minima are ∑i=58Ai, ∑i=89Ai, ∑i=913Ai and ∑i=1115Ai, respectively. With increase in the mass of compound nuclei, Z=6 becomes more prominent as compared to its neighboring fragments which is also observed in the experimental data. The LPs cross sections (σLPs) in the decay of 26–29Al⁎ are also estimated. We find that the value of ∑P0 of LPs for 26,27Al⁎ is less as compared to that for 28,29Al⁎, contrary to the value of ∑P. Eventually, the cross sections for LPs are having higher contribution in the decay of 28,29Al⁎ in agreement with the experimental data. As expected for light mass nuclei, the σLPs for 26,27Al⁎ find better comparison with experimental data for spherical considerations rather than β2 deformations. We also conform Bohr's hypothesis via the entrance channel independence for compound nucleus 28Al⁎ formed through O18+10B and F19+9Be channels at an excitation energy ECN⁎∼44 MeV, by having a unique choice of neck length parameter ΔR for both the reactions.