Competition between fusion and quasifission in a heavy fusing system: Diffusion of nuclear shapes through a dynamical collective potential energy landscape

Alexis Diaz-Torres
Phys. Rev. C 74, 064601 – Published 1 December 2006

Abstract

A theory of the competition between fusion and quasifission in a heavy fusing system is proposed, which is based on a master equation and the two-center shell model. Fusion and quasifission arise from a diffusion process in an ensemble of nuclear shapes, each of which evolves toward the thermal equilibrium. The fusing system moves on a dynamical (time-dependent) collective potential energy surface that is initially diabatic and gradually becomes adiabatic. Calculations for several reactions leading to No256 are performed within a simplified two-dimensional model. Among other important conclusions, the results indicate that (i) the diabatic effects play a very important role in the onset of fusion hindrance for heavy systems and (ii) very asymmetric reactions induced by closed-shell nuclei seem to be the best suited to synthesize the heaviest compound nuclei.

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  • Received 1 April 2006

DOI:https://doi.org/10.1103/PhysRevC.74.064601

©2006 American Physical Society

Authors & Affiliations

Alexis Diaz-Torres*

  • Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia and Institut für Theoretische Physik der Johann Wolfgang Goethe–Universität Frankfurt, Max von Laue Str. 1, D–60438 Frankfurt am Main, Germany

  • *Electronic address: alexis.diaz-torres@anu.edu.au

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Vol. 74, Iss. 6 — December 2006

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