FUSION OF ⁶He+²³⁸U SYSTEM: HALO AND BREAKUP EFFECTS

Abstract

We have studied the role of spatial extension (Halo structure) of 6 He and that of breakup reaction channel in the fusion of 6 He +238 U 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.

Systematic failure of static nucleus–nucleus potential to explore sub-barrier fusion dynamics

“…The properties of Coulomb and centrifugal terms are well understood, while because of the existence of large ambiguities regarding the optimum form of the nuclear potential, the various aspects of nuclear interaction are still unresolved. The large sets of parameterization of the nuclear potential are used frequently in the literature to analyze the experimental data in connection with heavy ion reactions [17][18][19][20][21][22][23][24]. In heavy ion fusion reactions, the static Woods-Saxon potential is used most frequently to probe the nuclear reaction dynamics, wherein the diffuseness parameter is related to the slope of the nuclear potential in the tail region of the Coulomb barrier.…”

Neutron transfer versus inelastic surface vibrations in the enhancement of sub-barrier fusion excitation function data and the energy dependent Woods–Saxon potential

“…Among various parameterizations of nuclear potential that have been used in the literature to explain the variety of different phenomena in connection with the heavy ion reactions , the three parametric Woods-Saxon potential is the most widely used. The diffuseness parameter of the Woods-Saxon potential is related to the slope of the nuclear potential in the tail region of the Coulomb barrier and, hence, defines the rate of fall of the fusion excitation function data at sub-barrier energies [34]. A value for the diffuseness parameter = a 0.65 fm has been deduced from the elastic scattering data and it is quite interesting to note that a wide range, = a 0.75 fm to = a 1.5 fm, of values of the diffuseness parameter is required to explore the sub-barrier fusion data [1][2][3][4][5].…”

Comprehensive analysis of heavy-ion fusion reactions around the Coulomb barrier

“…The existing literature [18][19][20][21][26][27][28][29][30][31][32][33][34][35][36] have cleared that the selection of nucleus-nucleus potential is critical for the understanding the fusion reaction kinetics. Among various nuclear potentials reported in the literature [18][19][20][21][26][27][28][29][30][31][32][33][34][35][36], the simple energy independent Woods-Saxon potential had enjoyed its status to analyze the nuclear interactions.…”