Abstract
To investigate the role of target deformation on incomplete fusion dynamics, a particle-gamma coincidence experiment has been performed at Inter University Accelerator Centre, New Delhi. Spin distributions for various evaporation residues populated via complete and incomplete fusion of 16 O with 124 Sn at 6.3MeV/nucleon have been measured. Experimentally measured spin distributions of the residues produced as incomplete fusion products associated with fast α and 2α-emission channels observed in forward cone are found to be distinctly different from those of the residues produced as complete fusion products. The mean value of input angular momentum J0 for evaporation residues produced through xn channels (complete fusion products) is found to be J0 ≈ 7ħ, while the mean value of input angular momentum J0 for the residues produced through direct αxn and 2αxn channels (incomplete fusion products) in forward cone, are found to be J0 ≈ 9ħ and ≈ 12ħ respectively for 16 O + 124 Sn (spherical) system [7]. The mean value of input angular momentum J0 for the system 16 O + 169 Tm (deformed) reported in ref. [8], are found to be ≈10ħ for xn-channels (complete fusion products) and for direct αxn and 2αxn channels (incomplete fusion products) the value of J0 approaches to ≈ 13ħ and ≈16ħ, respectively. The mean values of the input angular momentum observed for xn (complete fusion products), αxn and 2αxn (incomplete fusion products) in 16 O + 124 Sn (spherical) system are smaller than that of the mean values of the input angular momentum observed for xn (complete fusion products), αxn and 2αxn (incomplete fusion products) in 16 O + 169 Tm (deformed) system. The comparison of data inferred that the mean values of the input angular momentum are smaller in case of spherical target than that of deformed target at same projectile energy of 16 O-ion beam. It means that the target deformation affect the incomplete fusion dynamics.
Highlights
The present in-beam charged-particle gamma coincidence experiment was performed at the Inter-University Accelerator Centre (IUAC), New Delhi, India, using the15UD Pelletron Accelerator
Only fast or incomplete fusion (ICF) α particles with energy greater than 17 MeV have been detected in the forward cone
The ICF reaction channels that were identified in the forward cone in coincidence with fast α -particles are
Summary
EPJ Web of Conferences can occur unless a part of the projectile is emitted to release excess input angular momentum. Prompt emission of a part of projectile takes place to provide sustainable input angular momentum to the system. After such an emission, the resulting input angular momentum carried by the remnant projectile is less than or equal to its own critical angular limit for fusion to occur with the target nucleus. Most of the ICF dynamics studies by charged particle-gamma coincidence technique have been carried out with low-Z (Z≤10) projectile induced reactions on heavy targets (A≥150). The measured mean values of input angular momentum in 16O + 124Sn (spherical) system [11] have been compared with the mean value of input angular momentum in 16O + 169Tm (deformed) system [12]
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