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Mesure de temps de fission par la méthode du blocage cristallin

Abstract : The nucleus evolution to the scission point is slowed down by nuclear dissipation in highly excited nuclei. This phenomena leads to longer fission times than expected by the Bohr and Wheeler's statistical model. A dynamical description of the nucleus has to be taken into account. Measuring fission times is then a real « probe » of nuclear dissipation effects.
We made a reverse kinematic experiment at GANIL in the 4 Pi neutron detector ORION, using a lead beam accelerated at 29 MeV/u on a single crystal silicium target mounted on a goniometer. We measured fission times of the projectile-like nuclei with the crystal blocking method, in function of initial excitation energy. This method, which consists in measuring directly the recoil distance to a row where the fission occurs in the crystal, gives access to long fission times (> 10-19 s) in the fission times distribution. Blocking dips of the <110> axis and (001) and (110) planes has been analysed with Monte-Carlo simulation code. For the first time in such simulation the particule evaporation of the fission fragments has been calculated in a precize way.
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Submitted on : Wednesday, October 30, 2002 - 9:11:13 AM
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  • HAL Id : tel-00001888, version 1



Frédéric Barrue. Mesure de temps de fission par la méthode du blocage cristallin. Physique Nucléaire Théorique [nucl-th]. Université Claude Bernard - Lyon I, 2002. Français. ⟨tel-00001888⟩



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