Study of intermediate velocity products in the Ar+Ni collisions between 52 and 95 A.MeV

Abstract

Intermediate velocity products in Ar+Ni collisions from 52 to 95 A.MeV are studied in an experiment performed at the GANIL facility with the 4$\pi$ multidetector INDRA. It is shown that these emissions cannot be explained by statistical decays of the quasi-projectile and the quasi-target in complete equilibrium. Three methods are used to isolate and characterize intermediate velocity products. The total mass of these products increases with the violence of the collision and reaches a large fraction of the system mass in mid-central collisions. This mass is found independent of the incident energy, but strongly dependent on the geometry of the collision. Finally it is shown that the kinematical characteristics of intermediate velocity products are weakly dependent on the experimental impact parameter, but strongly dependent on the incident energy. The observed trends are consistent with a participant-spectator like scenario or with neck emissions and/or break-up.

37 pages, 13 figures

References in corpus (3)

• Isospin dependence of collective flow in heavy-ion collisions at intermediate energies
• Flow of Nucleons and Fragments in 40Ar + 27Al Collisions Studied with AMD
• Fragment Flow and the Nuclear Equation of State

Cited by in corpus (30)

• Critical Behavior in Light Nuclear Systems: Experimental Aspects
• Neck fragmentation reaction mechanism
• On the reliability of negative heat capacity measurements
• Dynamical effects in multifragmentation at intermediate energies
• Probing the density dependence of the symmetry potential with peripheral heavy-ion collisions
• Multifragmentation of a very heavy nuclear system (I): Selection of single-source events
• Bimodality: a possible experimental signature of the liquid-gas phase transition of nuclear matter
• Correlations and Characterization of Emitting Sources
• Measurements of sideward flow around the balance energy
• Model-independent tracking of criticality signals in nuclear multifragmentation data
• Isospin diffusion in semi-peripheral ${}^{58}Ni$ + ${}^{197}Au$ collisions at intermediate energies (I): Experimental results
• IMF isotopic properties in semi-peripheral collisions at Fermi energies
• Neutron to proton ratios of quasiprojectile and midrapidity emission in the ${}^{64}$Zn + ${}^{64}$Zn reaction at 45 MeV/nucleon
• A Quasi-Classical Model of Intermediate Velocity Particle Production in Asymmetric Heavy Ion Reactions
• Effect of the intermediate velocity emissions on the quasi-projectile properties for the Ar+Ni system at 95 A.MeV
• Isospin effects on two-particle correlation functions in E/A = 61 MeV 36Ar + 112,124Sn reactions
• Relevance of equilibrium in multifragmentation
• Fragment properties of fragmenting heavy nuclei produced in central and semi-peripheral collisions
• From fusion to total disassembly: global stopping in heavy-ion collisions
• Comparison of mid-velocity fragment formation with projectile-like decay
• Examination of cluster production in excited light systems at Fermi energies from new experimental data and comparison with transport model calculations
• Origins of Intermediate Velocity Particle Production in Heavy Ion Reactions
• Isospin effects and symmetry energy studies with INDRA
• Distinctive features of Coulomb-related emissions in peripheral heavy ion collisions at Fermi energies
• Study and validation of a new "3D Calorimetry" of hot nuclei with the HIPSE event generator
• Analysis of charged particle emission sources and coalescence in E/A = 61 MeV ${}^{36}$Ar + ${}^{27}$Al, ${}^{112}$Sn and ${}^{124}$Sn collisions
• A new "3D Calorimetry" of hot nuclei
• Limitation of energy deposition in classical N body dynamics
• Isospin Diffusion in ${}^{58}$Ni-Induced Reactions at Intermediate Energies
• Implications of two-body fragment decay for the interpretation of emission chronology from velocity-gated correlation functions