Fusion ofLi6withTb159at near-barrier energies

Abstract

Complete and incomplete fusion cross sections for 6 Li + 159 Tb have been measured at energies around the Coulomb barrier by the γ -ray method. The measurements show that the complete fusion cross sections at above-barrier energies are suppressed by ∼34% compared to coupled-channel calculations. A comparison of the complete fusion cross sections at above-barrier energies with the existing data for 11,10 B + 159 Tb and 7 Li + 159 Tb shows that the extent of suppression is correlated with the α separation energies of the projectiles. It has been argued that the Dy isotopes produced in the reaction 6 Li + 159 Tb at below-barrier energies are primarily due to the d transfer to unbound states of 159 Tb, while both transfer and incomplete fusion processes contribute at above-barrier energies.

Systematic study of breakup effects on complete fusion at energies above the Coulomb barrier

“…In the last few years, CF cross sections for many reactions involving weakly bound nuclei have been measured Fusion Function [ [21][22][23][24][25]. The suppression of complete fusion cross sections above the Coulomb barrier due to the breakup has been observed in these reaction systems.…”

“…* sgzhou@itp.ac.cn Several methods have been adopted to investigate the influence of the breakup on fusion reactions around the Coulomb barrier [15][16][17][18][19][20]. One of the most widely employed approaches is to compare the data with either the predictions of coupled channel (CC) calculations without the breakup channels [10,11,[21][22][23][24][25] or the predictions of a single barrier penetration model (SBPM) [5,[12][13][14]. It was found that the CF cross sections are suppressed at energies above the Coulomb barrier.…”

Recent developments in fusion and direct reactions with weakly bound nuclei

“…Pradhan et al [335] measured the CF and ICF cross sections for the 6 Li + 159 Tb systems, at energies above the Coulomb barrier. The experiments were performed at BARC-Mumbai, using the gamma ray method.…”

Systematic study of suppression of complete fusion in reactions involving weakly bound nuclei at energies above the Coulomb barrier

“…This shortcoming can be avoided within a new dynamical quantum approach that includes SCF as well as ICF from the bound state(s) of the projectile [26]. In addition, the comparison of experimental fusion cross sections with either the predictions of coupled-channel (CC) calculations without the breakup and transfer channels [12][13][14][15][16][27][28][29][30][31] or the predictions of a single barrier penetration model (SBPM) [9][10][11] shows that CF cross sections are suppressed owing to the breakup at energies above the Coulomb barrier.…”