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Étude du moment angulaire transferé en fonction de l’énergie d'excitation dans la réaction Kr + U a 35 A.MeV

Abstract : The aim of this study is to measure the angular momentum transferred to the target-like product, in the Kr + U reaction at 35 A.MeV, as a function of the excitation energy. The measured neutron multiplicity, as seen by the detector ORION, was used as the basic event selection criterion. This multiplicity also allows an estimation of the excitation energy transferred to the target-like product on an event by event basis. The study of the behaviour of the projectile-like component allows one to characterize two-body mechanisms, which are associated with a large energy dissipation for less peripheral collisions. The spin transferred to the target-like component is deduced from the out-plane angular distributions of the fission fragments. The study of the angular correlation between these fission fragments confirms that the dominant mechanism is essentially a two-body process. We show that the angular momentum values obtained, as a function of the excitation energy of the target-like product, have little dependence on the time taken for the nucleus to reach the saddle point. We observe a constant increase in the target-like component's spin, varying from 15ℎ to 60ℎ, as the excitation energy increases from roughly 8 to 400 MeV. For the higher excitation energies the spin does not increase. This behaviour reflects the vanishing binary fission mechanism at high angular momenta.
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Contributor : Michel Lion <>
Submitted on : Thursday, October 20, 2016 - 4:08:45 PM
Last modification on : Thursday, February 1, 2018 - 1:35:53 AM


  • HAL Id : in2p3-00008712, version 1



M. Josset. Étude du moment angulaire transferé en fonction de l’énergie d'excitation dans la réaction Kr + U a 35 A.MeV. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen, 1996. Français. ⟨in2p3-00008712⟩



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