Abstract
The dynamical cluster-decay model (DCM) of Gupta and collaborators has been applied successfully to the decay of very-light (A ∼ 30), light (A ∼ 40−80), medium, heavy and super-heavy mass compound nuclei for their decay to light particles (evaporation residues, ER), fusion-fission (ff), and quasi-fission (qf) depending on the reaction conditions. We intend to extend here the application of DCM to study the extreme case of decay of very-light nuclear systems 20,21,22Ne∗ formed in 10,11B+10,11B reactions, for which experimental data is available for their binary symmetric decay (BSD) cross sections, i.e., σBSD. For the systems under study, the calculations are presented for the σBSD in terms of their preformation and barrier penetration probabilities P0 and P. Interesting results are that in the decay of such lighter systems there is a competing reaction mechanism (specifically, the deep inelastic orbiting of non-compound nucleus (nCN) origin) together with ff. We have emipirically estimated the contribution of σnCN. Moreover, the important role of nuclear structure characteristics via P0 as well as angular momentum ℓ in the reaction dynamics are explored in the study.
Highlights
Compound Nucleus (CN) formed in low energy (E < 10 MeV/nucleon) heavy-ion reaction is highly excited and carry large angular momentum depending upon the energy in the entrance channel and loose it during decay by emitting γ-rays, multiple light particles (LPs: A≤4, Z≤2) like n, p, α or their heavier counterparts, and fusion-fission consisting of symmetric and near-symmetric fission fragments, including the intermediate mass fragments(IMFs)/ clusters [1,2,3,4,5]
Concluding, the application of decay Model (DCM) is extended to the decay of very light mass compound systems 20Ne∗, 21Ne∗ and 22Ne∗
We studied the decay of these systems and calculated σ f f for the binary symmetric decay (BSD) as the dynamical fragmentation process
Summary
Compound Nucleus (CN) formed in low energy (E < 10 MeV/nucleon) heavy-ion reaction is highly excited and carry large angular momentum depending upon the energy in the entrance channel and loose it during decay by emitting γ-rays, multiple light particles (LPs: A≤4, Z≤2) like n, p, α or their heavier counterparts (referred to as evaporation residues ER), and fusion-fission (ff) consisting of symmetric and near-symmetric fission fragments, including the intermediate mass fragments(IMFs)/ clusters [1,2,3,4,5]. In addition to CN decay, non-compound nucleus (nCN) decay may take place, like the quasifission (qf), deep-inelastic (DI) orbitting, etc., and contribute to the overall decay cross section. The binary symmetric decay (BSD) of very-light mass compound systems 20,21,22Ne∗ formed in 10,11B+10,11B reactions at Elab = 48 MeV and different excitation energies EC∗ N, is studied here by using the DCM. Within the DCM, the decay of these lighter composite systems with comparable size as well as angular momentum, with different excitation energies, is highly interesting to study, keeping in view the expected significant role of nuclear structure (via P0 here) when a single nucleon is added The same equation (3) is used for σnCN or σorb, calculated as the DI orbiting (orb) process, since incoming nuclei keep their identity, and P0=1, and P is calculated for incoming channel
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