Les désexcitations γ des niveaux 1- situés à 12,44 et 13,09 MeV dans le noyau 16O ont été étudiées et deux nouvelles transitions mises en évidence. En outre au cours de ce travail les paramètres des deux niveaux 1- ont été redéterminés
c~ particles were measured in coincidence with projectile-like reaction products (oxygen and carbon) produced in deep-inNastic 160+SSNi collisions at about 6 MeV/N bombarding energy. The kinematic analysis of the HI and c~ energies measured as a function of O~ gives strong evidence for a sequential process: the target-like fragments are excited by the deep-inelastic collision and undergo subsequent ~ decay. In contrast, the angular correlations show a pronounced forward peak, indicative of direct or pre-equilibrium c~ emission. The emission time for the latter is estimated to be of the order of 2 x 10 -21 s. To resolve this conflict of co-existing statistical and direct features of the pre-equilibrium emission, the concept of a hot spot is proposed. From the angular correlation and from the e multiplicities, a local temperature of T-~ 3.5 MeV is deduced which agrees well with the temperature derived from the shape of the e spectra. The spot size is estimated to be 1/5 of the sphere.
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