Fusion dynamics of 30Si +238U reaction using variety of interaction potentials

Abstract

The fusion dynamics of [Formula: see text] reaction has been studied using different theoretical approaches like energy-dependent Woods–Saxon potential (EDWSP) model, coupled channel formulation and Wong approach. At sub-barrier energies, the anomalously large enhancement of the fusion cross-section signifies the importance of barrier modification effects for the adequate addressal of experimental data. The EDWSP model, wherein barrier modification effects are introduced via the energy-dependent diffuseness parameter, is used to examine the sub-barrier fusion anomalies. In the framework of coupled channel model, the impacts of collective excitations and/or static deformations of colliding partners are incorporated in the fusion dynamics. In Wong formula, the role of different Skyrme forces such as SIII, KDE0v1, SkT1, SSk, GSkI is analyzed to address the observed fusion enhancement around the Coulomb barrier. Among these, GSkI and SSk forces seem more appropriate for the addressal of fusion dynamics at sub-barrier energies while SIII, SkT1 and KDE0v1 forces give relatively better results at the above barrier region. The SSk (GSkI) force at higher energies overestimate the experimental data and hence treated with the [Formula: see text]-summed Wong approach. The effect of deformations and optimum orientations is duly incorporated in the calculation and hence gives better description to the observed data. In addition, the fusion cross-sections are predicted over extreme energies using EDWSP and [Formula: see text]-summed Wong approach. It is worth mentioning here that the different theoretical approaches (EDWSP, coupled channel and Wong) induce similar kinds of barrier lowering effects, henceforth, they reasonably describe the sub-barrier fusion data of [Formula: see text] reaction.

Fusion of spherical-octupole pairs of colliding nuclei for compact and elongated configurations *

“…tion. As a consequence, an enhancement is observed in the fusion probability of heavy/superheavy nuclear systems, with the inclusion of -deformed nuclei as the target, projectile, or both the colliding partners [13][14][15][16][17][18][19][20][21]. In addition, the relevance of higher-order deformations (with axial-and reflection-symmetries) is also analyzed in reference to the fusion barrier characteristics [22][23][24][25][26].…”

“…However, the exploration of octupole deformed nuclei is important for extracting the appropriate nuclear structure because significant enhancements can be found in electric dipole moments (EDMs) [27]. Also, in the nuclear fusion process, it has been observed that [35] the nonzero EDMs in one of the fusion partners ( 16 O+ 144 Ba and 224 Ra) may have a significant impact on the fusion barrier and corresponding cross-sections.…”

“…This study explores the effect of octupole deformation and the related optimum orientations on approximately 200 spherical-octupole pairs of colliding nuclei. For this combination, the doubly magic nuclei 16 O and 48 Ca are used as projectiles to strike an octupole deformed target. The considered options for the soft-and rigid-pear shapes of octupoles belong to different mass-regions of the Periodic Table . For the previously mentioned reactions, Section II describes the formalism used to determine the fusion barrier and cross-sections.…”

“…The considered options for the soft-and rigid-pear shapes of octupoles belong to different mass-regions of the Periodic Table . For the previously mentioned reactions, Section II describes the formalism used to determine the fusion barrier and cross-sections. In Section III, we discuss the calculation and results; it is observed that the cold configuration criteria of could reproduce the experimental data of the 16 O+ 150 Sm ( ) reaction [1] across the Coulomb barrier energies. Finally, in Section IV, a brief summary is given.…”

“…Using the respective of -deformed nuclei for cold and hot optimum orientations, we analyzed the impact of the soft-and rigid-pear shapes of octupole deformed nuclei on the fusion barrier characteristics (barrier height and barrier position ). This analysis is applied to approximately 200 spherical-plus-deformed nuclear partners, that is, 16 O, 48 Ca+octupole deformed nuclei. Compared with the compact configuration, the elongated fusion configuration has a relatively larger impact on the fusion barrier and cross-sections owing to the inclusion of deformations up to .…”