Quasiclassical model of intermediate velocity particle production in asymmetric heavy ion reactions

Chernomoretz, Ariel; Gingras, L.; Larochelle, Y.; Beaulieu, Luc; Roy, R.; St-Pierre, C.; Dorso, C. O.

doi:10.1103/physrevc.65.054613

Cited by 31 publications

(29 citation statements)

References 21 publications

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“…The method yields mass multiplicities, momenta, excitation energies, secondary decay yields, etc. comparable to experimental data [31,43].…”

Section: Collisionssupporting

confidence: 89%

See 1 more Smart Citation

Fragmentation of Neutron Star Matter

Alcain¹,

Dorso²

2017

Nuclear Particle Correlations and Cluster Physics

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Background: Neutron stars are astronomical systems with nucleons submitted to extreme conditions. Due to the long range coulomb repulsion between protons, the system has structural inhomogeneities. These structural inhomogeneities arise also in expanding systems, where the fragment distribution is highly dependent on the thermodynamic conditions (temperature, proton fraction, . . . ) and the expansion velocity.Purpose: We aim to find the different regimes of fragment distribution, and the existence of infinite clusters. Method:We study the dynamics of the nucleons with a semiclassical molecular dynamics model. Starting with an equilibrium configuration, we expand the system homogeneously until we arrive to an asymptotic configuration (i. e. very low final densities). We study the fragment distribution throughout this expansion. Results:We found the typical regimes of the asymptotic fragment distribution of an expansion: u-shaped, power law and exponential. Another key feature in our calculations is that, since the interaction between protons is long range repulsive, we do not have always an infinite fragment. We found that, as expected, the faster the expansion velocity is, the quicker the infinite fragment disappears. Conclusions:We have developed a novel graph-based tool for the identification of infinite fragments, and found a transition from U-shaped to exponential fragment mass distribution with increasing expansion rate.

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“…The method yields mass multiplicities, momenta, excitation energies, secondary decay yields, etc. comparable to experimental data [31,43].…”

Section: Collisionssupporting

confidence: 89%

“…With respect to collisions, these potentials are known to reproduce nucleon-nucleon cross sections from low to intermediate energies [18], and it has been used extensively in studying heavy ion collisions (see Ref. [31,35]). For such reactions, two "nuclei" are boosted against each other at a desired energy.…”

Section: Collisionsmentioning

confidence: 99%

Fragmentation of Neutron Star Matter

Alcain¹,

Dorso²

2017

Nuclear Particle Correlations and Cluster Physics

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“…This parameter-free model has been successfully used to study nuclear reactions obtaining mass multiplicities, momenta, excitation energies, secondary decay yields, critical phenomena and isoscaling behavior that have been compared to experimental data [48][49][50][51][52][53][54][55][56][57]. More recently, and of interest to the present work, the model was used to study infinite nuclear systems at low temperatures [58] and in neutron star crust environments [45][46][47].…”

Section: Classical Molecular Dynamicsmentioning

confidence: 99%

Isospin-asymmetric nuclear matter

et al. 2014

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This study uses classical molecular dynamics to simulate infinite nuclear matter and study the effect of isospin asymmetry on bulk properties such as energy per nucleon, pressure, saturation density, compressibility and symmetry energy. The simulations are performed on systems embedded in periodic boundary conditions with densities and temperatures in the ranges ρ = 0.02 to 0.2 f m −3 and T = 1, 2, 3, 4 and 5 MeV, and with isospin content of x = Z/A = 0.3, 0.4 and 0.5. The results indicate that symmetric and asymmetric matter are self-bound at some temperatures and exhibit phase transitions from a liquid phase to a liquid-gas mixture. The main effect of isospin asymmetry is found to be a reduction of the equilibrium densities, a softening of the compressibility and a disappearance of the liquid-gas phase transition. A procedure leading to the evaluation of the symmetry energy and its variation with the temperature was devised, implemented and compared to mean field theory results.

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“…It has been successfully used in heavy-ion reaction studies to help understand experimental data [24], identify phase transitions signals and other critical phenomena [25][26][27][28], explore the caloric curve [29,30] and isoscaling [31,32]. Synoptically, CM D uses two two-body potentials to describe the motion of nucleons by solving their classical equations of motion.…”

Section: Classical Molecular Dynamics Modelmentioning

confidence: 99%

Effect of Coulomb screening length on nuclear “pasta” simulations

et al. 2014

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We study the role of the effective Coulomb interaction strength and length on the dynamics of nucleons in conditions according to those in a neutron star's crust. Calculations were made with a semi-classical molecular dynamics model, studying isospin symmetric matter at sub-saturation densities and low temperatures. The electrostatic interaction between protons interaction is included in the form of a screened Coulomb potential in the spirit of the Thomas-Fermi approximation, but the screening length is artificially varied to explore its effect on the formation of the nonhomogeneous nuclear structures known as "nuclear pasta". As the screening length increases, we can see a transition from a one-per-cell pasta regime (due exclusively to finite size effects) to a more appealing multiple pasta per simulation box. This shows qualitative difference in the structure of neutron star matter at low temperatures, and therefore, special caution should be taken when the screening length is estimated for numerical simulations.

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Quasiclassical model of intermediate velocity particle production in asymmetric heavy ion reactions

Cited by 31 publications

References 21 publications

Fragmentation of Neutron Star Matter

Fragmentation of Neutron Star Matter

Isospin-asymmetric nuclear matter

Effect of Coulomb screening length on nuclear “pasta” simulations

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