Observation of incomplete fusion at low angular momenta

Abstract

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.

Towards Understanding Incomplete Fusion Reactions at Low Beam Energies: Modified Sum Rule Model

“…Earlier works in the literature demonstrated the success of SRM in reproducing the cross-section for ICF channels in 12 C+ 160 Gd [49] and 14 N+ 159 Tb [8] reactions at high beam energies. However, it failed at low beam energies [33,34,37,38], as in our present work.…”

“…We initially attempted to understand the experimental cross-sections with theoretical calculations based on the original sum rule model (SRM) [8] but could not find a good agreement. The major discrepancy was the low estimate of cross-sections for the ICF channels corresponding to α and 8 Be breakup, as also pointed out in earlier studies [33,34]. Moreover, contradictory observations were reported regarding the onset of ICF channels.…”

“…This has been found to be consistent with the multiplicity measurements [4,8,20] at high beam energies. In several studies [19,[33][34][35][36][37][38] at beam energies just above the Coulomb barrier, the maximum entrance channel's angular momentum ( max ) is quite low. On the other hand, cr , that is independent of beam energy in the original SRM, remains unaffected.…”