Abstract
Evaporation residue (ER) excitation function in the complete fusion of 16O with 194Pt is measured around the Coulomb barrier using gas-filled mode of the HYbrid Recoil mass Analyser (HYRA) at the Inter University Accelerator Centre (IUAC), New Delhi. Measured ER excitation function is compared with statistical model calculation. Nuclear dissipation strength β = 1.5 is required to explain the experimental data at higher excitation energies.
Highlights
Heavy ion fusion reactions provide important information on the dynamics and decay of hot nuclear matter
Where YER is the Evaporation residue (ER) yield at the focal plane, YM is the yield at the monitor detector, ǫHYRA is the HYbrid Recoil mass Analyser (HYRA) transmission efficiency and ΩM is the solid angle subtended by the monitor detector
The present study shows that a dissipative strength of β = 1.5 is required to fit the experimental ER data in the complete fusion of 16O with 194Pt
Summary
Heavy ion fusion reactions provide important information on the dynamics and decay of hot nuclear matter. The compound nucleus (CN) decay mainly via particle evaporation and fission. ERs are the true signatures of the CN formation and can be used as an excellent probe for exploring the onset of non-compound nuclear processes as well as nuclear dissipation. Onset of dissipative forces causes hindrance to fission, which is reflected in enhancement of ER cross section over the predictions of standard statistical model. Non-compound nuclear processes hinder the formation of the CN. This is manifested in reduction of ER cross section. In this way, ER excitation function can be used as a powerful tool to understand the fusion-fission mechanism in heavy systems. We here report the ER excitation function measurement in the complete fusion of 16O with 194Pt at beam energies near and above the Coulomb barrier
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