Dynamical approach to heavy-ion induced fission using actinide target nuclei at energies around the Coulomb barrier

Y. Aritomo, K. Hagino, K. Nishio, and S. Chiba
Phys. Rev. C 85, 044614 – Published 20 April 2012

Abstract

In order to describe heavy-ion fusion reactions around the Coulomb barrier with an actinide target nucleus, we propose a model which combines the coupled-channels approach and a fluctuation-dissipation model for dynamical calculations. This model takes into account couplings to the collective states of the interacting nuclei in the penetration of the Coulomb barrier and the subsequent dynamical evolution of a nuclear shape from the contact configuration. In the fluctuation-dissipation model with a Langevin equation, the effect of nuclear orientation at the initial impact on the prolately deformed target nucleus is considered. Fusion-fission, quasifission, and deep quasifission are separated as different Langevin trajectories on the potential energy surface. Using this model, we analyze the experimental data for the mass distribution of fission fragments (MDFF) in the reactions of 34,36S + 238U and 30Si + 238U at several incident energies around the Coulomb barrier. We find that the time scale in the quasifission as well as the deformation of fission fragments at the scission point are different between the 30Si + 238U and 36S + 238U systems, causing different mass asymmetries of the quasifission.

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  • Received 29 February 2012

DOI:https://doi.org/10.1103/PhysRevC.85.044614

©2012 American Physical Society

Authors & Affiliations

Y. Aritomo1,2, K. Hagino3, K. Nishio1, and S. Chiba4,1

  • 1Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
  • 2Flerov Laboratory of Nuclear Reactions, JINR, Dubna 141980, Russia
  • 3Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 4Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan

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Issue

Vol. 85, Iss. 4 — April 2012

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