Production mechanism of hot nuclei in violent collisions in the Fermi energy domain

Abstract

A production mechanism of highly excited nuclei formed in violent collisions in the Fermi energy domain is investigated. The collision of two nuclei is decomposed into several stages which are treated separately. Simplified exciton concept is used for the description of pre-equilibrium emission. A modified spectator-participant scenario is used where motion along classical Coulomb trajectories is assumed. The participant and one of the spectator zones undergo incomplete fusion. Excitation energies of both cold and hot fragment are determined. Results of the calculation are compared to recent experimental data in the Fermi energy domain. Data on hot projectile-like, mid-velocity and fusion-like sources are described consistently. Geometric aspects of pre-equilibrium emission are revealed. Explanations to previously unexplained experimental phenomena are given. Energy deposited into non-thermal degrees of freedom is estimated.

To appear in Nuclear Physics A, 27 pages, 19 figures, LaTeX

References in corpus (6)

• Multifragmentation of a very heavy nuclear system (II): bulk properties and spinodal decomposition
• Multifragmentation of a very heavy nuclear system (I): Selection of single-source events
• Effect of nucleon exchange on projectile multifragmentation in the reactions of 28Si + 112Sn and 124Sn at 30 and 50 MeV/nucleon
• Effect of the intermediate velocity emissions on the quasi-projectile properties for the Ar+Ni system at 95 A.MeV
• Inhomogeneous isospin distribution in the reactions of 28Si + 112Sn and 124Sn at 30 and 50 MeV/nucleon
• Energy and angular momentum sharing in dissipative collisions

Cited by in corpus (10)

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• Verification of high-energy transport codes on the basis of activation data
• Effect of nuclear periphery on nucleon transfer in peripheral collisions
• Heavy Residues with A<90 in the Asymmetric Reaction of 20 AMeV 124Sn+27Al as a Sensitive Probe of the Onset of Multifragmentation
• MCNP6 fragmentation of light nuclei at intermediate energies
• Neutron-rich rare isotope production from projectile fission of heavy beams in the energy range of 20 MeV/nucleon
• Production of cold fragments in nucleus-nucleus collisions in the Fermi-energy domain
• Heavy Residue Formation in 20 MeV/nucleon 197Au + 90Zr collisions
• Statistical and dynamical aspects in the decay of hot neutron-rich nuclei