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Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in the Ni64+U238 reaction

Kazuyuki Sekizawa and Kazuhiro Yabana
Phys. Rev. C 93, 054616 – Published 23 May 2016
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Abstract

Background: Multinucleon transfer (MNT) and quasifission (QF) processes are dominant processes in low-energy collisions of two heavy nuclei. They are expected to be useful to produce neutron-rich unstable nuclei. Nuclear dynamics leading to these processes depends sensitively on nuclear properties such as deformation and shell structure.

Purpose: We elucidate reaction mechanisms of MNT and QF processes involving heavy deformed nuclei, making detailed comparisons between microscopic time-dependent Hartree-Fock (TDHF) calculations and measurements for the Ni64+U238 reaction.

Methods: Three-dimensional Skyrme-TDHF calculations are performed. Particle-number projection method is used to evaluate MNT cross sections from the TDHF wave function after collision.

Results: Fragment masses, total kinetic energy (TKE), scattering angle, contact time, and MNT cross sections are investigated for the Ni64+U238 reaction. They show reasonable agreements with measurements. At small impact parameters, collision dynamics depends sensitively on the orientation of deformed U238. In tip (side) collisions, we find a larger (smaller) TKE and a shorter (longer) contact time. In tip collisions, we find a strong influence of quantum shells around Pb208.

Conclusions: It is confirmed that the TDHF calculations reasonably describe both MNT and QF processes in the Ni64+U238 reaction. Analyses of this system indicate the significance of the nuclear structure effects such as deformation and quantum shells in nuclear reaction dynamics at low energies.

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  • Received 25 January 2016

DOI:https://doi.org/10.1103/PhysRevC.93.054616

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Kazuyuki Sekizawa1,2,* and Kazuhiro Yabana2,3,†

  • 1Faculty of Physics, Warsaw University of Technology, ulica Koszykowa 75, 00-662 Warsaw, Poland
  • 2Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
  • 3Center for Computational Sciences, University of Tsukuba, Tsukuba 305-8577, Japan

  • *sekizawa@if.pw.edu.pl
  • yabana@nucl.ph.tsukuba.ac.jp

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Issue

Vol. 93, Iss. 5 — May 2016

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