Dynamical dipoleγradiation in heavy-ion collisions on the basis of a quantum molecular dynamics model

Abstract

Dynamical dipole $\ensuremath{\gamma}$-ray emission in heavy-ion collisions is explored in the framework of the quantum molecular dynamics model. The studies are focused on systems of $^{40}\mathrm{Ca}$ bombarding $^{48}\mathrm{Ca}$ and its isotopes at different incident energies and impact parameters. Yields of $\ensuremath{\gamma}$ rays are calculated and the centroid energy and dynamical dipole emission width of the $\ensuremath{\gamma}$ spectra are extracted to investigate the properties of $\ensuremath{\gamma}$ emission. In addition, sensitivities of dynamical dipole $\ensuremath{\gamma}$-ray emission to the isospin and the symmetry energy coefficient of the equation of state are studied. The results show that detailed study of dynamical dipole $\ensuremath{\gamma}$ radiation can provide information on the equation of state and the symmetry energy around the normal nuclear density.