Study of a fast collective mode in deep inelastic reactions: Quantal fluctuations |
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Authors: | M. Berlanger A. Gobbi F. Hanappe U. Lynen C. Ngô A. Olmi H. Sann H. Stelzer H. Richel M. F. Rivet |
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Affiliation: | 1. Gesellschaft für Schwerionenforschung mbH, Darmstadt, Germany 2. Université Libre de Bruxelles, CP 229, Bd du Triomphe, B 1050, Bruxelles, Belgique 3. Max-Planck-Institut für Kernphysik, Heidelberg, Germany 4. Institute de Physique Nucléaire, B.P.N°1, 91406, Orsay, France 5. CEN-Saclay, DPHN-MF, B.P. N°2, 91190, Gif-sur-Yvette, France
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Abstract: | We have measured for the 430 MeV86Kr+92.98Mo systems the triple differential cross sectiond 3 σ/dEdAdZ (E=kinetic energy,A=mass andZ=atomic number) of the reaction products in the angular range (θ=25, 45°). We focussed attention on a fast collective mode in deep inelastic reactions: the neutron excess or charge equilibration. This mode is shown to relax very quickly to equilibrium within a time scale of the order of 10?22s. It is shown that this collective degree of freedom exhibit a quantal behavior which can be seen in the observation of quantal fluctuations. The experimental results are discussed in terms of a simple equilibrium model. The giant dipole resonance of the composite system could be closely connected to this neutron excess mode. |
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