Nuclear Flow Excitation Function

Abstract

We consider the dependence of collective flow on the nuclear surface thickness in a Boltzmann--Uehling--Uhlenbeck transport model of heavy ion collisions. Well defined surfaces are introduced by giving test particles a Gaussian density profile of constant width. Zeros of the flow excitation function are as much influenced by the surface thickness as the nuclear equation of state, and the dependence of this effect is understood in terms of a simple potential scattering model. Realistic calculations must also take into account medium effects for the nucleon--nucleon cross section, and impact parameter averaging. We find that balance energy scales with the mass number as $A^{-y}$, where $y$ has a numerical value between 0.35 and 0.5, depending on the assumptions about the in-medium nucleon-nucleon cross section.

11 pages (LaTeX), 7 figures (not included), MSUCL-884, WSU-NP-93-1

Cited by in corpus (54)

• Recent Progress and New Challenges in Isospin Physics with Heavy-Ion Reactions
• Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies
• Effects of Compression and Collective Expansion on Particle Emission from Central Heavy-Ion Reactions
• Elliptic flow and system size dependence of transition energies at intermediate energies
• Isospin dependence of collective flow in heavy-ion collisions at intermediate energies
• Nuclear Stopping as A Probe to In-medium Nucleon-nucleon Cross Section in Intermediate Energy Heavy Ion Collisions
• Isospin effects on the energy of vanishing flow in heavy-ion collisions
• Elliptic flow in intermediate energy heavy ion collisions and in-medium effects
• In-medium NN cross sections determined from stopping and collective flow in intermediate-energy heavy-ion collisions
• Elliptic flow in heavy ion collisions near the balance energy
• Critical Enhancement of the In-medium Nucleon-Nucleon Cross Section at low Temperatures
• Event Generators for High-Energy Physics Experiments
• Mass Dependence of Disappearance of Transverse Flow
• Sensitivity of the transverse flow towards symmetry energy
• In-medium effects for nuclear matter in the Fermi energy domain
• Disappearance of Transverse Flow in Central Collisions for Heavier Nuclei
• Isospin effects in the disappearance of flow as a function of colliding geometry
• Surveying the Nucleon-Nucleon Momentum Correlation Function in the Framework of Quantum Molecular Dynamics Model
• Differential flow in heavy-ion collisions at balance energies
• Nuclear Transparency in Monte Carlo Neutrino Event Generators
• Onset of Nuclear Matter Expansion in Au+Au Collisions
• Isospin effect on nuclear stopping in intermediate energy Heavy Ion Collisions
• Nuclear Flow in Consistent Boltzmann Algorithm Models
• Isospin Effect on the Process of Multifragmentation and Dissipation at Intermediate Energy Heavy Ion Collisions
• Exploring binding energy and separation energy dependences of HBT strength
• Isospin fractionation in the nucleon emissions and fragment emissions in the intermediate energy heavy ion collisions
• Entrance channel dependence and isospin dependence of preequilibrium nucleon emission in intermediate energy heavy ion collisions
• Transverse momentum dependence of transverse flow in relativistic heavy-ion collisions
• Influence of a momentum dependent interaction on the isospin dependence of fragmentation and dissipation in intermediate energy heavy ion collisions
• Transport model study of nuclear stopping in heavy ion collisions over an energy range from 0.09A GeV to 160A GeV
• Density dependence of in-medium nucleon-nucleon cross sections
• Probing the Isospin Dependent In-Medium Nucleon-Nucleon Cross Section by Nucleon Emissions
• Aspects of the momentum dependence of the equation of state and of the residual $NN$ cross section, and their effects on nuclear stopping
• Study of final-state interactions of protons in neutrino-nucleus scattering with INCL and NuWro cascade models
• Influence of medium correction of nucleon nucleon cross section on the fragmentation and nucleon emission
• Bayesian inference of in-medium baryon-baryon scattering cross sections from HADES proton flow data
• Microscopic approach to the nucleon-nucleon effective interaction and nucleon-nucleon scattering in symmetric and isospin-asymmetric nuclear matter
• Can quark effects be observed in intermediate heavy ion collisions?
• Effects of $P_{\mathrm{tot}}$ gates and velocity gates on light-particle momentum correlation in intermediate-energy heavy-ion collisions
• Mean free paths and in-medium scattering cross sections of energetic nucleons in neutron-rich nucleonic matter within the relativistic impulse approximation
• Nucleon-number scalings of anisotropic flows and nuclear modification factor for light nuclei in the squeeze-out region
• Symmetry energy and nucleon-nucleon cross sections
• Simulating spin dynamics with spin-dependent cross sections in heavy-ion collisions
• Final-state interactions in neutrino-induced proton knockout from argon in MicroBooNE
• In-medium nucleon-nucleon elastic cross sections determined from nucleon-induced reaction cross sections data
• Medium influence of the nucleon nucleon cross section on the fragmentation
• Probing the isospin dependent mean field and nucleon nucleon cross section in the medium by the nucleon emissions
• Evolutions of in-medium baryon-baryon scattering cross sections and stiffness of dense nuclear matter from Bayesian analyses of FOPI proton flow excitation functions
• Screening effects on the elastic nucleon-nucleon cross section in relativistic nuclear matter
• Symmetry potentials and in-medium nucleon-nucleon cross sections within the Nambu-Jona-Lasinio model in relativistic impulse approximation
• Nuclear medium effect on nuclear modification factor of protons and pions in intermediate-energy heavy ion collisions
• Comparison of Validation Methods of Simulations for Final State Interactions in Hadron Production Experiments
• Enhancement of nucleon-nucleon cross section in sidewards flowing nuclear matter through zero sound mode excitation
• Nuclear stopping for heavy-ion induced reactions in the Fermi Energy range : from 1-Body to 2-Body dissipation