Time-dependent mean-field investigations of the quasifission process

A.S Umar,C Simenel,S Ayik

doi:10.1051/epjconf/201716300061

Abstract

We demonstrate that the microscopic Time-dependent Hartree-Fock (TDHF) theory provides an important approach to shed light on the nuclear dynamics leading to the formation of superheavy elements. In particular, we discuss studying quasifission dynamics and calculating ingredients for compound nucleus formation probability calculations. We also discuss possible extensions to TDHF to address the distribution of observables.

Highlights

Synthesis of superheavy elements (SHE) [1] with fusionevaporation reactions is strongly hindered by the quasifission (QF) mechanism which prevents the formation of an equilibrated compound nucleus and depends on the structure of the reactants
Within the last few years the timedependent Hartree-Fock (TDHF) approach [2,3,4] has been utilized for studying the dynamics of quasifission [3, 5,6,7,8,9,10,11,12,13,14] and scission dynamics [15,16,17,18,19,20]
Much progress has been obtained by the community working on developments and applications of the timedependent mean-field approaches to nuclear dynamics since the last edition of the FUSION conference [25,26,27,28,29,30]

Summary

Introduction

Synthesis of superheavy elements (SHE) [1] with fusionevaporation reactions is strongly hindered by the quasifission (QF) mechanism which prevents the formation of an equilibrated compound nucleus and depends on the structure of the reactants. Within the last few years the timedependent Hartree-Fock (TDHF) approach [2,3,4] has been utilized for studying the dynamics of quasifission [3, 5,6,7,8,9,10,11,12,13,14] and scission dynamics [15,16,17,18,19,20]. The study of quasifission is showing a great promise to provide insight based on very favorable comparisons with experimental data [8, 10]. These include comparison with experimental kinetic energy (TKE) and mass-angle distributions (MAD). An extension of TDHF called the density-constrained TDHF [42, 43] (DC-TDHF) has been used to obtain microscopic potential barriers, capture cross-sections, and excitation energies for superheavy [44, 45] and lighter systems [46, 47]

Capture cross-sections

Mass-angle distributions

Fragment TKEs

Shape evolutions

Findings

Beyond TDHF Calculations