Small suppression of the complete fusion of the ${}^6\mathrm{Li}+{}^{96}\mathrm{Zr}$ system at near-barrier energies

The measurements of complete fusion cross sections for ${}^6\mathrm{Li}+{}^{96}\mathrm{Zr}$ have been performed at energies around the Coulomb barrier by the online $\gamma$-ray method. The complete fusion cross sections at above-barrier energies were found to be suppressed by $\sim 25\%$. A comparison of the systematics of complete fusion suppression with the existing data for ${}^6\mathrm{Li}$+ heavy targets with the present results shows that the systematics of the suppression factor observed for ${}^6\mathrm{Li}$-induced fusion in the heavy mass region may not be consistent in lighter target mass region.

Figure 1

Typical online $\gamma$-ray spectrum depicting the $\gamma$ lines of different evaporation residues via complete fusion in the ${}^6\mathrm{Li}+{}^{96}\mathrm{Zr}$ system at the bombarding energy of 28 MeV.

Figure 2

Ratio of individual channel cross sections to the CF cross sections as a function of beam energy for ${}^6\mathrm{Li}+{}^{96}\mathrm{Zr}$. The dot lines represent the theoretical estimation of PACE2.

Figure 3

Measured complete, incomplete, and total fusion cross section at near the Coulomb barrier energies.

Figure 4

Complete and total fusion cross sections at energies near the Coulomb barrier for the ${}^6\mathrm{Li}+{}^{96}\mathrm{Zr}$ system. The dashed line represents the coupled channel calculations multiplied by 0.75.