Role of hexadecapole deformation of projectile $^{28}$Si in heavy-ion fusion reactions near the Coulomb barrier

TL;DR

This paper investigates how the hexadecapole deformation ($eta_4$) of the $^{28}$Si projectile influences heavy-ion fusion reactions near the Coulomb barrier, revealing sensitivity of fusion dynamics to higher order nuclear deformations.

Contribution

It demonstrates the impact of $eta_4$ deformation on fusion barrier distribution and provides a method to estimate deformation parameters of radioactive nuclei via fusion reactions.

Findings

Fusion barrier distribution is sensitive to the sign and magnitude of $eta_4$.

$^{28}$Si has a large positive $eta_4$ deformation.

Study offers an indirect approach to determine deformation parameters of radioactive nuclei.

Abstract

The vast knowledge of strong influence of quadrupole deformation $\beta_2$ of colliding nuclei on heavy-ion subbarrier fusion reactions inspires a desire to quest the sensitivity of fusion dynamics to higher order deformations, such as $\beta_4$ and $\beta_6$ deformations. However, such studies have rarely been carried out, especially for deformation of projectile nuclei. In this article, we investigated the role of $\beta_4$ of the projectile nucleus in fusion of the $^{28}$Si + $^{92}$Zr system. We demonstrated that the fusion barrier distribution is sensitive to the sign and the value of the $\beta_4$ parameter of the projectile, $^{28}$Si, and confirmed that the $^{28}$Si nucleus has a large positive $\beta_4$. This study opens an indirect way to estimate deformation parameters of radioactive nuclei using fusion reactions, which is otherwise difficult due to experimental constraints.