Statistical and dynamical aspects in the decay of hot neutron-rich nuclei

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Authors
Veselsky, M.
Keksis, A. L.
Souliotis, G. A.
Wang, K.
Bell, E.
Shetty, D. V.
Jandel, M.
Yennello, S. J.
Ma, Y. G.
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Abstract
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The signal of isospin-asymmetric phase transition in the evolution of the chemical potential was observed for hot quasi-projectiles produced in the reactions 40,48Ca + 27Al confirming an analogous observation in the lighter system 28Si + 112,124Sn. With increasing mass, the properties of hot quasi-projectiles become increasingly influenced by the secondary emission. Thermodynamical observables exhibit no sensitivity to the different number of missing neutrons in the two reactions 40,48Ca + 27Al, thus providing a signal of dynamical emission of neutrons, which can be related to formation of a very neutron-rich low-density region (neck) between the projectile and target.
Comment: LaTeX, article expanded, 2 figures added, 17 pages, 7 figures
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Nuclear Experiment
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