Narrow Results

We have studied the effects of nuclear induced breakup channel coupling on the fusion cross-section for ⁶Li+¹²C and ⁶He+¹²C systems in the near barrier energy regime using the dynamic polarization potential (DPP) approach. It has been found that there is enhancement in the fusion cross-section with respect to standard one-dimensional barrier penetration model in the below barrier energy regime while at energies above the barrier there is suppression of fusion cross-section with respect to simple barrier penetration model is observed. The agreement between data and predictions for ⁶Li+¹²C system improves significantly as a result of the inclusion of nuclear induced DPP.

The reactions including the stable weakly bound nucleus ⁹Be have been studied using the classical trajectory model accompanied with the experimental breakup function and the Aage-Winther interaction potential (AW95). In these calculations, the no-capture breakup and the incomplete fusion cross-sections as well as their competition at around the Coulomb barrier have been investigated. Our calculations showed that at a given far-Coulomb-barrier energy the incomplete fusion reaction in different distributions of angular momentum and energies can dominate the no-capture breakup reaction. This dominating process is reversed at the near-barrier energies.

The excitation functions for total, complete and incomplete fusion (TF, CF and ICF) mechanisms have been investigated for ⁹Be + ${}^{181}$Ta system at near and above barrier energy region. The calculations are performed by employing the code FRESCO based on continuum discretized coupled channel (CDCC) method. An enhancement is observed in the TF excitation function with respect to the data when breakup couplings are taken into account. Further, the CF and ICF probabilities, defined as the ratio of CF (ICF) cross-sections to the TF cross-sections, are also calculated. The dominance of breakup induced fusion is noticed at near barrier energies.

The elastic scattering angular distributions and the fusion excitation function data for the reactions induced by the loosely bound projectile ⁹Be on ${}^{27}$Al, ${}^{28}$Si, ${}^{144}$Sm and ${}^{208}$Pb targets at near and above barrier energies have been analyzed with a motive to investigate the importance of breakup couplings within the framework of continuum discretized coupled channels approach. It is found that at energies much higher than Coulomb barrier, the breakup effects are insignificant for light targets while for heavy targets, the breakup effects play a dominant role at these energies. But at energies comparable to the barrier height, the role of breakup becomes crucial for light mass targets also.

The available experimental data for the elastic scattering of the isobar nuclei ⁶Li and ⁶He on ${}^{64}$Zn have been reanalyzed in the available energy range using the optical model, double folding (DF) (Sao Paulo), and crystal model (CM). Double-folding (DF) and crystal model (CM) have been used to investigate the experimental data as a real part of the optical potential, while the imaginary part was taken in Woods–Saxon (WS) shape. One value of the real part of the optical potential has been applied to the two systems under consideration. The distance of the closest approach of the ⁶Li (⁶He) + ${}^{64}$Zn systems has been extracted from the available experimental data using different methods. The extracted potential from the ⁶Li and ⁶He elastically scattered by ${}^{64}$Zn data could be used as the basis for the creation of a simple global optical potential for ⁶Li and ⁶He. The extracted normalization factor ($N_r$) was equal to the unity during the fitting process avoiding its unfortunate value (in the range 0.5–0.7) exists in the literature. It was observed that interaction distances vary slowly with the energy of the projectile and strongly depend on the projectile properties. The halo properties of ⁶He have a significant effect on the calculated reaction cross-sections. Different methods have been applied to ⁶He and ⁶Li elastically scattered by ${}^{64}$Zn, where fair agreement between them has been observed.