Abstract
Peripheral and (semi)peripheral collisions of with at 35A MeV have been studied in the environment of the -detector AMPHORA. These classes of collisions were selected by using as a trigger (Z = 3 - 11) fragments detected in the vicinity of the grazing angle with energies higher than the ones corresponding to half the velocity of the beam. The inclusive data indicate the clear signature of projectile fragmentation. An analysis of momentum distributions leads to values of in agreement with the fragmentation model of Goldhaber. The fragment data (momentum distribution widths and isotopic yields) are also satisfactorily described by the cluster model of Friedman. Exclusive data are focused on measurements involving fragments emitted at forward angles in coincidence with a light charged particle (LCP) emitted at backward angles (and at forward angles or not). Analysis of their associated LCP multiplicities is consistent with a massive transfer mechanism via a two-body final state. Comparison with the predictions of a statistical model code (CASCADE) reveals an energy and angular momentum deposition in the target-like nuclei at values up to 2A MeV and respectively involving a significant emission of pre-equilibrium particles at an early stage of these (semi)peripheral collisions.
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