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Abstract
Present work deals with experimental studies of incomplete fusion reaction dynamics using off-line γ -ray spectrometry at energies as low as ≈3-6 MeV/nucleon. Excitation functions for five reaction products populated via complete and/or incomplete fusion processes in 16 O+130 Te system have been measured and compared with the predictions of the statistical model code PACE4. A significant enhancement in the measured excitation functions compared to theoretical predictions for α -emitting channels has been observed and is attributed to incomplete fusion processes. The relative strength of incomplete fusion has been found to increase with projectile energy. Results show that incomplete fusion is associated even for angular momenta lesser than the critical angular momentum for complete fusion and also reveals importance of incomplete fusion even at energies as low as ≈3-6 MeV/nucleon.
Highlights
2 ExperimentsA beam of 16O7+ obtained from the 15-UD Pelletron accelerator of the Inter-University Accelerator Centre, New Delhi, India, has been used to irradiate 130Te target samples, prepared using vacuum evaporation on Al foils of thickness ≈6.75 mg/cm2
Theoretical calculations of cross-sections for the residues populated via complete fusion (CF) and/or incomplete fusion (ICF) channels have been done using the code PACE4 [18]
It is possible to calculate the cross-sections for CF and ICF channels separately using the ’sumrule’ model [20, 21], based on the idea of a generalized concept of critical angular momentum following partial statistical equilibrium
Summary
A beam of 16O7+ obtained from the 15-UD Pelletron accelerator of the Inter-University Accelerator Centre, New Delhi, India, has been used to irradiate 130Te target samples (enrichment ≈61%), prepared using vacuum evaporation on Al foils of thickness ≈6.75 mg/cm. Two stacks, containing two 130Te samples each, followed by Al catchers, were irradiated at 85 and 90 MeV, respectively, in the General Purpose Scattering Chamber (having in-vacuum transfer facility) with a constant beam current (≈3 pnA) for ≈8 h duration. EPJ Web of Conferences measured cross-sections has been considered. The errors in the measured production cross sections may arise due to (i) the nonuniformity of target foils, (ii) fluctuations in the beam current, (iii) the uncertainty in geometry dependent efficiency of HPGe detector, and (iv) due to the dead time of the spectrometer. The overall errors including statistical errors are estimated to be ≥15%, excluding the uncertainty in branching ratio, decay constant, etc
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