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

• Published in: Nuclear physics. A 2010-06, Vol.837 (3), p.163-175
• Main Authors: Veselsky, M., Souliotis, G.A., Keksis, A.L., Jandel, M., Shetty, D.V., Yennello, S.J., Wang, K., Ma, Y.G.
• Format: Article
• Language: English
• Subjects: 27Al( 40Ca, X); 48Ca, X; composite system excitation energies for incomplete fusion using FAUST array; deduced; effect of missing neutrons; formula omitted; isoscaling; light-particle velocity distributions; measured; Nuclear reactions; projectile-like fragment charge and mass distributions; thermodynamical properties
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2010.02.013

A signal of isospin-asymmetric phase transition in the evolution of the chemical potential was observed in hot quasi-projectiles produced in the reactions Ca 40 , 48 + Al 27 confirming an analogous observation in the lighter quasi-projectiles observed in the reaction Si 28 + Sn 112 , 124 (Veselsky et al., 2004 [1]). With increasing mass, the properties of hot quasi-projectiles become increasingly influenced by secondary emission. Thermodynamical observables exhibit no sensitivity to the different number of missing (undetected) neutrons in the two reactions Ca 40 , 48 + Al 27 and provide a signal of dynamical emission of neutrons, which can be related to the formation and disintegration (rupture) of a very neutron-rich low-density region (neck) between the projectile and target.