Dynamical effects on the way to fusion of very heavy nuclei |
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Authors: | I N Mikhailov T I Mikhailova Ch Briançon F Hanappe |
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Institution: | (1) Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna, Russia;(2) Dzhelepov Laboratory of Nuclear Problems, JINR, Dubna, Russia;(3) CSNSM (IN2P3-CNRS), Orsay, France;(4) ULB, Bruxelles, Belgium |
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Abstract: | The central collision of 40Ar and 208Pb is studied considering the ellipsoidal deformations and isovector dipole mode of motion in the approaching phase. The collective
energy dissipation is suggested to originate from the Fermi surface deformation which is treated as a kinematically independent
mode of motion within the canonical Lagrange-Rayleigh dynamics. The possible extensions of the approach are discussed. The
potential energy surface, calculated using the generalized (folded) surface potential, is studied. The saddle point in the
potential energy surface lying at the border of strongly deformed compact configurations is located. The potential energy
at this point is about 10MeV smaller than that of the ions touching each other in the spherical shape. The examination of
trajectories followed by the system in its evolution shows that the inertia forces strongly hinder the motion of ions along
the potential energy valley. The collective energy dissipated during the approach is found to be smaller than the difference
in the potential energies at saddle point and at the touching configuration of unpolarized ions. |
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Keywords: | 24 10 -i Nuclear reaction models and methods 25 70 Jj Fusion and fusion-fission reactions |
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