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Study of a fast collective mode in deep inelastic reactions: Quantal fluctuations

par Berlanger, Michel ;Gobbi, Alberto;Hanappe, Francis ;Lynen, Uli;Ngô, Christian;Olmi, Alessandro;Sann, Hendrik;Stelzer, Herbert;Richel, Hervé ;Rivet, M.F.
Référence Zeitschrift für Physik A Atoms and Nuclei, 291, 2, page (133-143)
Publication Publié, 1979-06

Article révisé par les pairs

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Résumé :

We have measured for the 430 MeV86Kr+92.98Mo systems the triple differential cross section d3σ/dEdAdZ (E=kinetic energy, A=mass and Z=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. © 1979 Springer-Verlag.