Multifragmentation of very heavy nuclear systems (III): fragment velocity correlations and event topology at freeze-out

Abstract

Kinetic energy spectra and fragment velocity correlations, simulated by means of stochastic mean-field calculations, are successfully confronted with experimental data for single multifragmenting sources prepared at the same excitation energy per nucleon in 32 AMeV 129Xe+natSn and 36 AMeV 155Gd+natU central collisions. Relying thus on simulations, average freeze-out times of 200-240 fm/c are estimated The corresponding spatial distributions of fragments are more compact for the lighter system (~3-4V\_0 vs ~8V\_0).

arXiv comment20 pages; 9 figures; To be published in Nuclear Physics A

References in corpus (16)

• The liquid to vapor phase transition in excited nuclei
• Limiting temperatures and the Equation of State of Nuclear Matter
• Characteristics of the fragments produced in central collisions of 129Xe+ natSn from 32 to 50 AMeV
• Evidence for Spinodal Decomposition in Nuclear Multifragmentation
• Multifragmentation of a very heavy nuclear system (II): bulk properties and spinodal decomposition
• Microscopic model approaches to fragmentation of nuclei and phase transitions in nuclear matter
• Imaging Sources with Fast and Slow Emission Components
• Multifragmentation of a very heavy nuclear system (I): Selection of single-source events
• Model-independent tracking of criticality signals in nuclear multifragmentation data
• Fragment Charge Correlations and Spinodal Decomposition in Finite Nuclear Systems
• Response of CsI(Tl) scintillators over a large range in energy and atomic number of ions (Part II): calibration and identification in the INDRA array
• Response of CsI(Tl) scintillators over a large range in energy and atomic number of ions (Part I): recombination and delta -- electrons
• Searching for the statistically equilibrated systems formed in heavy ion collisions
• Fragmentation path of excited nuclear systems
• Freeze-out volume in multifragmentation - dynamical simulations
• Homogeneity and Size Effects on the Liquid-Gas Coexistence Curve

Cited by in corpus (20)

• Nuclear multifragmentation and phase transition for hot nuclei
• Systematics of Stopping and Flow in Au+Au Collisions
• Liquid-Gas phase transition in nuclei
• Correlations and Characterization of Emitting Sources
• Isospin Distillation with Radial Flow: a Test of the Nuclear Symmetry Energy
• Fragment properties of fragmenting heavy nuclei produced in central and semi-peripheral collisions
• New isospin e ffects in central heavy-ion collisions at Fermi energies
• Yield scaling, size hierarchy and fluctuations of observables in fragmentation of excited heavy nuclei
• Investigation of collective radial expansion and stopping in heavy ion collisions at Fermi energies
• Constrained caloric curves and phase transition for hot nuclei
• Bimodalities : a survey of experimental data and models
• Reaction and fusion cross sections for the near-symmetric system ${}^{129}Xe{+}^{nat}Sn$ from $8$ to $35$ $AMeV$
• Probing the nuclear EOS with fragment production
• Coulomb chronometry to probe the decay mechanism of hot nuclei
• Density dependence of isospin observables in spinodal decomposition
• Source shape determination with directional fragment-fragment velocity correlations
• The behaviour of constrained caloric curves as ultimate signature of a phase transition for hot nuclei
• The prominent role of the heaviest fragment in multifragmentation and phase transition for hot nuclei
• Sequential fissions of heavy nuclear systems
• Break-up fragment topology in statistical multifragmentation models