M. K. Pradhan

Fusion ofLi6withTb159at near-barrier energies

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

Influence of projectile α-breakup threshold on complete fusion

Abstract Complete fusion excitation functions for B 11 , 10 + Tb 159 have been measured at energies around the respective Coulomb barriers, and the existing complete fusion measurements for Li 7 + Tb 159 have been extended to higher energies. The measurements show significant reduction of complete fusion cross sections at above-barrier energies for both the reactions, B 10 + Tb 159 and Li 7 + Tb 159 , when compared to those for B 11 + Tb 159 . The comparison shows that the extent of suppression of complete fusion cross sections is correlated with the α-separation energies of the projectiles. Also, the two reactions, B 10 + Tb 159 and Li 7 + Tb 159 were found to produce incomplete fusion products at energies near the respective Coulomb barriers, with the α-particle emitting channel being the favoured incomplete fusion process in both the cases.

Sub- and above-barrier fusion of loosely bound 6Li with 28Si

Fusion excitation functions are measured for the system 6Li + 28Si using the characteristic

Fusion cross sections for Li 6 , 7 + Mg 24 reactions at energies below and above the barrier

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Importance of the1n-stripping process in the6Li + 159Tb reaction

-ray method, encompassing both the sub-barrier and above-barrier regions, viz, Elab = 7-24 MeV. Two separate experiments were performed, one for the above-barrier region ( Elab = 11-24 MeV) and another for the below-barrier region ( Elab = 7-10 MeV). The results were compared with our previously measured fusion cross-section for the 7Li + 28Si system. We observed the enhancement of the fusion cross-section at sub-barrier regions for both 6Li and 7Li , but the yield was substantially larger for 6Li . However, for well-above-barrier regions, a similar type of suppression was identified for both the systems.

Sub-barrier fusion excitation for the system 7 Li+ 28 Si

Measurement of fusion cross sections for the {sup 6,7}Li + {sup 24}Mg reactions by the characteristic {gamma}-ray method has been done at energies from below to well above the respective Coulomb barriers. The fusion cross sections obtained from these {gamma}-ray cross sections for the two systems are found to agree well with the total reaction cross sections at low energies. The relatively large difference between total cross sections and measured fusion cross sections at higher energies is consistent with the fact that other channels, in particular breakup, open up with an increase of bombarding energy. The breakup channel, however, appears not to have any influence on fusion cross sections. The critical angular momenta (l{sub cr}) deduced from the fusion cross sections are found to have an energy dependence similar to other Li-induced reactions.

The study of threshold behaviour of effective potential for Li6+Ni58,64 systems

The inclusive cross sections of the

Investigation ofLi6+Ni64fusion at near-barrier energies

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Barrier distribution functions for the system Li6+Ni64 and the effect of channel coupling

-particles produced in the reaction

Probing the fusion ofLi7withNi64at near-barrier energies

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