Collision Systems
Au+Au
Collision of two gold nuclei at a kinetic energy of 1.23A GeV.
Ag+Ag
Collision of two silver nuclei at a kinetic energy of 1.58A GeV.
C+C
Collision of two carbon nuclei at a kinetic energy of 2A GeV.
Ar+KCl
Collision of an argon projectile with a potassium chloride target at a kinetic energy of 1.76A GeV. For comparison with the experiment, the KCl is represented by an argon with a mass number of 37.
Test Particles
0-10%
Collision of two gold nuclei at a kinetic energy of 1.23A GeV. The impact parameter is 3.14 fm, which is the mean of the 0-10% centrality bin. Each real particle is represented by 20 test particles.
10-20%
Collision of two gold nuclei at a kinetic energy of 1.23A GeV. The impact parameter is 5.70 fm, which is the mean of the 10-20% centrality bin. Each real particle is represented by 20 test particles.
20-30%
Collision of two gold nuclei at a kinetic energy of 1.23A GeV. The impact parameter is 7.38 fm, which is the mean of the 20-30% centrality bin. Each real particle is represented by 20 test particles.
Densities and Energy Momentum Tensor
Density with Velocity
Hadron density and Landau velocity of a gold-gold collision at a kinetic energy of 1.23A GeV. Surfaces of constant density are shown and the direction of the landau velocity is indicated by the arrows in the z=0 plane. The arrows are colored according to the magnitude of the landau velocity.
Pressure Anisotropy
Pressure anisotropy in a collision of two gold nuclei at a kinetic energy of 1.23A GeV. The pressure anisotropy as defined in D. Oliinychenko et al. Phys.Rev. C93 (2016) no.3 is calculated in the z=0 plane from the energy momentum tensor. After some time the pressure anisotropy starts to vanish, which is a condition for thermalization. The white surface indicates the region with sufficient hadron density.
Velocity Field
Visualization of the Landau velocity field in a collision of two gold nuclei at a kinetic energy of 1.23A GeV. The source of each line is the position of a testparticle in the calculation. The lines follow the velocity field until they reach a region with low density. Note that the lines are not the actual trajectories of the particles but reflect the collective velocity.
Density
Hadron density in a collision of two gold nuclei at a kinetic energy of 1.23A GeV with an impact paramter of 3.14 fm.
Different SMASH Setups
Box
Infinite matter calculation in a box with periodic boundary conditions.
Sphere
Sphere calculation. Particles are initialised in a sphere without boundary conditions so that the sphere will expand.
Movies with Music
Elevator
Head on Ar+KCl collision at a kinetic energy of 1.76A GeV. The particle mass is represented by both the coloring and radii of the spheres. In the background plays a catchy and relaxing elevator type of music.
Dramatic
Head on collision of two carbon nuclei at a kinetic energy of 2.0A GeV. The particle mass is represented by both the coloring and radii of the spheres. In the background plays a dramatic tune underlying the journey of a lonesome nucleon.
Shredder
Collision of two gold nuclei at a kinetic energy of 1.23A GeV. The particle mass is represented by both the coloring and the radii of the spheres. In the background plays a shredded guitar, use headphones.
Rotation
Collision of two silver nuclei. Before the collision, the camera rotates around the nuclei to give a better picture of the initial state. The spectators are highlighted in red while for the other particles the number of binary interactions is encoded in the color.
Rotation with Explanation
Collision of two silver nuclei. Before the collision, the camera rotates around the nuclei to give a better picture of the initial state. The spectators are highlighted in red while for the other particles the number of binary interactions is encoded in the color. [Extended version with explanations]
Different Backgrounds
Au+Au (RHIC)
Collision of two gold nuclei at top RHIC energy (center of mass energy of 200 GeV). The particles are colored according to their species.
Au+Au
Collision of two gold nuclei at a kinetic energy of 1.23A GeV.
Ag+Ag
Collision of two silver nuclei at a kinetic energy of 1.58A GeV.
C+C
Collision of two carbon nuclei at a kinetic energy of 2A GeV.
Ar+KCl
Collision of an argon projectile with a potassium chloride target at a kinetic energy of 1.76A GeV. For comparison with the experiment, the KCl is represented by an argon with a mass number of 37.
Nuclei at Rest
Nucleons and Density
Nucleons and energy density of a gold nucleus with potentials and Fermi motion at rest.
Breathing Nucleus
Gold nucleus with potentials and Fermi motion at rest.
Effect of Potentials
Comparison of a nucleus with and without nuclear potentials.
Exploding nucleus
Gold nucleus with fermi motion but without potentials. The nucleons themselves and the density are shown side by side.