Pre-equilibrium dipole excitation and gamma-ray fragment angular correlation in the S-32+Ge-74 reaction

We report on the results obtained from the study of the S-32 +Ge-74 deep inelastic reaction at. incident energy E = 320 MeV. High-energy gamma-rays were detected in an array of 6 seven-pack BaF2 clusters. Coincidence with complex fragments detected in 12 three-stage telescopes ensured the selection of peripheral reaction events. In order to investigate the pre-equilibrium dipole strength excitation two independent analyses were performed. In the first analysis the energy spectra of the gamma-rays were evaluated in the statistical model framework while in the second one the gamma-ray fragment angular correlation with respect to the nuclear spin vector of the composite system was studied. Both methods indicate the excitation of dipole strength in the highly deformed dinucleus and provide dipole resonance parameter sets that are in good agreement with each other.