Narrow Results

An examination of the role of the cluster in nuclear reactions is made in the longstanding case of ¹²C+¹²C cluster resonances in ²⁴Mg. A description of both resonant scattering and breakup measurements can be found in terms of shape isomeric cluster structures.

Cross section and analyzing power A_y of reaction at were measured and large disagreements with 3N calculations were found especially at forward angles. Effects of 2π3NF are too small to explain the discrepancy. To microscopically investigate the discrepancy, a ²H(p, pp)n experiment is planned.

We have studied the role of spatial extension (Halo structure) of ⁶He and that of breakup reaction channel in the fusion of ⁶He+²³⁸U system. The breakup channel effects are taken into account within the framework of the dynamic polarisation potential approach. It has been found that the fusion cross section enhances due to the static effects of spatial extension of the projectile in the entire energy region. The breakup effects, however, results in the above barrier suppression and below barrier small enhancement in the fusion cross section. The matching between the data and the predictions improves significantly by the inclusion of both static and breakup effects.

Recent experimental results for the fusion of the weakly bound nucleus ⁹Be with spherical targets are analyzed by dynamical classical trajectories approach. In this approach, the Proximity model has been used to calculate the nuclear part of interaction potentials. Having determined the breakup functions and interaction potentials for ⁹Be + ¹²⁴Sn, ⁸⁹Y, ¹⁴⁴Sm and ²⁰⁸Pb reactions, the complete and incomplete fusion (ICF) cross-sections are calculated by classical trajectories model and our results show a good description of the experimental data. We have stressed on the ICF probability (P_ICF) for chosen reactions. The obtained results show that the (P_ICF) based on our calculations are in a good agreement with both experimental data and empirical predictions [J. Hinde et al., Phys. Rev. Lett.89, 272701 (2002)].

We have calculated excitation functions of incomplete fusion, complete fusion and total fusion processes for ${}^9\mathrm{\text{Be}}+{}^{64}\mathrm{\text{Zn}}$ system at near and above barrier energies. In particular, breakup effects of weakly bound projectile ${}^9\mathrm{\text{Be}}$, which has been considered as a two body system $({}^8\mathrm{\text{Be}}+n)$ with a breakup threshold of 1.667 MeV, have been studied. The calculations are performed by using the code FRESCO, which is based on Continuum Discretized Coupled Channel (CDCC) approach. The present analysis of the total fusion excitation function for the system ${}^9\mathrm{\text{Be}}+{}^{64}\mathrm{\text{Zn}}$ shows that it is suppressed at above barrier energies and enhanced at sub barrier energies when the breakup effects are taken into account. In addition, the comparison of the probabilities of incomplete fusion from neutron capture and that from alpha capture shows the dominance of former over later.