Abstract
A strong preference for the emission of nonequilibrium light particles in the reaction plane was observed, suggesting the existence of collective motion of the emitting source for intermediate energy heavy ion reactions. The sign of the average emission angle of non-equilibrium charged particles (1 ≤ Z ≤ 15) was determined for 14 N-induced reactions on 154 Sm at E/A = 35 MeV from the circular polarization of coincident γ-rays emitted from the residual nucleus. All the detected charged particles are preferentially emitted to negative angles. These effects are consistent with deflection of the particles to the reaction plane and to negative scattering angles by the attractive nuclear mean field. Numerical solutions of the Boltzmann-Uehling-Uhlenbeck equation demonstrate that the experimental result is sensitive to the interplay between nuclear mean field and nuc1eon-nuc1eon collisions. By extending the calculations to higher energies, the sign of the emission angles is predicted to change above E/A = 100 MeV.
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