Abstract. The excitation functions of the evaporation residues, produced via complete fusion and incomplete fusion reactions of 11 B + 122 Sn, were measured for the projectile energy of around 6 MeV/A by the off-line gamma spectrometry. The cross sections have been compared with the statistical model code Projected Angular Momentum Coupled Evaporation (PACE4). The original sum rule model underestimated the ICF cross sections. We therefore made modification in the model mainly to incorporate the energy dependence in the definition of critical angular momentum. Using this modified sum rule model, we found a significant improvement in the results.
The 129 Xe nucleus has been investigated using the techniques of -ray spectroscopy. The heavy-ion fusion reaction 124 Sn( 11 B, p5n) 129 Xe was utilized at the beam energy of 70 MeV. Three new quasi-particle bands have been identified. From our polarization results, the yrast band was confirmed to have negative parity. However, the parity of the bandhead of an excited quasi-particle band was changed from negative to positive. In the yrast band, the backbending was found to be due to the alignment of neutrons.
We investigated the enhanced production of nuclei formed via incomplete fusion (ICF) reactions near and above the Coulomb barrier energies (5–8 MeV/A). The cross-sections of the evaporation residues formed in the reactions—11B+124Sn, 10B+124Sn and 11B+122Sn—were measured using off-line gamma-ray spectrometry. The sum rule model (SRM) by Wilczyński et al. predicted the cross-section values too low compared to our experimental results. In earlier studies, the same model has been very successful in explaining ICF reactions at high beam energies (>10 MeV/A). We, therefore, modified the SRM, specifically incorporating the energy dependence in the definition of critical angular momentum ℓcr. The resulting modified SRM gave an improved theoretical estimate for the reactions we studied.
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