Quasifission at extreme sub-barrier energies

TL;DR

This paper investigates quasifission at deep sub-barrier energies using the quantum diffusion approach, focusing on reactions where complete fusion is suppressed, to better understand the quasifission process in nuclear reactions.

Contribution

It introduces a quantum diffusion model to analyze quasifission at energies below the compound nucleus formation threshold, highlighting its role in nuclear reaction dynamics.

Findings

Quasifission dominates at deep sub-barrier energies.

Capture cross sections are analyzed without complete fusion contributions.

The model explains experimental observations of quasifission in these reactions.

Abstract

With the quantum diffusion approach the behavior of the capture cross-section is investigated in the reactions $^{92,94}$Mo + $^{92,94}$Mo, $^{100}$Ru + $^{100}$Ru, $^{104}$Pd + $^{104}$Pd, and $^{78}$Kr + $^{112}$Sn at deep sub-barrier energies which are lower than the ground state energies of the compound nuclei. Because the capture cross section is the sum of the complete fusion and quasifission cross sections, and the complete fusion cross section is zero at these sub-barrier energies, one can study experimentally the unique quasifission process in these reactions after the capture.