Influence of symmetry energy on electromagnetic field during heavy-ion collisions
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Date
2025
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Abstract
Heavy-ion collision simulations in intermediate energy regime using isospin quantum molecular
dynamics model have been proposed as a novel means to glean information about the high density behaviour
of nuclear matter. Herein, the influence of modelling the pressure gradient by changing stiffness parameter and
isospin asymmetry on the dynamics of charged particles have been investigated. In this research, three different
values of stiffness parameter, γ = 0.66 (soft), 1 (stiff) and 2 (super-stiff), to tune the anisotropic transverse pressure
gradients have been considered to explore the influence of density-dependent symmetry energy
Esym(ρ) = Esym(ρ0) ρ
γ
ρ0
on the electromagnetic field and energy density evolution. Stiffer symmetry energy (γ = 2) leads to larger
pressure gradient than softer symmetry energy (γ = 0.66) that drives stronger expansion resulting in higher
intensity of (eBy(0,0,0))max and |E · B|max. The correlation of eccentricity, nuclear stopping, centrality with
the electromagnetic field and energy density have been established for different stiffness parameters. To deepen
this study, the influence of isospin asymmetry (N/Z) on the time evolution of electromagnetic field has also been
explored