Quasifission dynamics in TDHF

A.S Umar,V.E Oberacker,C Simenel

doi:10.1051/epjconf/201611701002

A.S Umar, V.E Oberacker + Show 1 more

Open Access

https://doi.org/10.1051/epjconf/201611701002

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Abstract

For light and medium mass systems the capture cross-section may be considered to be the same as that for complete fusion, whereas for heavy systems leading to superheavy formations the evaporation residue cross-section is dramatically reduced due to the quasifission (QF) and fusion-fission processes thus making the capture cross-section to be essentially the sum of these two cross-sections, with QF occurring at a much shorter time-scale. Consequently, quasifission is the primary reaction mechanism that limits the formation of superheavy nuclei. Within the last few years the time-dependent Hartree-Fock (TDHF) approach has been utilized for studying the dynamics of quasifission. The study of quasifission is showing a great promise to provide insight based on very favorable comparisons with experimental data. In this article we will focus on the TDHF calculations of quasifission observables for the $^{48}$Ca+$^{249}$Bk system.

Highlights

One of the most fascinating research areas involving low-energy nuclear reactions is the search for superheavy elements
To pinpoint the root of this difference it is important to understand the details of the entrance channel dynamics of these systems since the properties of the dinuclear system at the capture point will strongly influence the outcome of the reaction
For light and medium mass systems the capture cross-section may be considered to be the same as that for complete fusion, whereas for heavy systems leading to superheavy formations the evaporation residue cross-section is dramatically reduced due to the quasi-fission [6] and fusion-fission processes, making the capture cross-section to be essentially the sum of these two cross-sections

Summary

Introduction

One of the most fascinating research areas involving low-energy nuclear reactions is the search for superheavy elements. Most dynamical models [7,8,9,10,11] argue that for heavy systems a dinuclear complex is formed initially and the barrier structure and the excitation energy of this precompound system will determine its survival to breaking up via quasifission. By virtue of long contact-times for quasifission and the energy and impact parameter dependence these calculations require extremely long CPU times.

Results

Conclusion