B. V. Jacak

Energy dependence of nuclear matter disassembly in heavy ion collisions

Abstract Measurements of light charged particle spectra from 20 Ne + Au at 100 and 156 MeV/nucleon are compared with results for similar systems at 9, 13, 19, 43, 241, 393, and 800 MeV/nucleon. Spectra at each energy are fitted with a moving source model to extract the temperatures, cross sections and source velocities for protons and light nuclei in the intermediate rapidity region. The 4 He/p production ratio decreases drastically with incident energy, whereas the d/p and t/p ratios are almost constant.

Influence of nucleon Fermi motion on incomplete fusion

Abstract Velocity spectra were measured for evaporation residues produced in fusion reactions induced by 5–35 MeV/ A 14 N. The results, together with published data for 16 O and 20 Ne induced fusion, are shown to reveal a projectile dependence of incomplete fusion processes. The data can be qualitatively described in terms of a picture which takes into account the vector addition of the center-of-mass velocities of the interacting nuclei with the intrinsic Fermi velocities of the nucleons.