Azimuthal anisotropy and multiplicities of hard photons and free nucleons in intermediate-energy heavy-ion collisions

Abstract

Anisotropic flow can offer significant information of evolution dynamics in heavy-ion collisions. A systematic study of the directed flow $v_1$ and elliptic flow $v_2$ of hard photons and free nucleons is performed for ${}^{40}$Ca+${}^{40}$Ca collisions in a framework of isospin dependent quantum molecular dynamics (IQMD) model. The study firstly reveals that thermal photons emitted in intermediate-energy heavy-ion collisions have the behaviors of directed and elliptic flows. The interesting phenomena of incident energy dependence of $v_1$ and $v_2$ for thermal photons in central collisions also confirmed that it can be regarded as a good probe of evolution dynamics. Moreover, the multiplicities of hard photons and free nucleons and their correlation are also investigated. We find that direct photon emission is positively related to free nucleons emission, however, there exists an anti-correlation for thermal photons with free nucleons.

9 pages, 10 figures

References in corpus (8)

• Critical Behavior in Light Nuclear Systems: Experimental Aspects
• Scaling of Anisotropic Flow and Momentum-Space Densities for Light Particles in Intermediate Energy Heavy Ion Collisions
• In-medium effects for nuclear matter in the Fermi energy domain
• Liquid-Gas phase transition in nuclei
• The interplay of short-range correlations and nuclear symmetry energy in hard photon productions from heavy-ion reactions at Fermi energies
• Hard photon flow and photon-photon correlation in intermediate energy heavy-ion collisions
• Properties of Thermal Photons at RHIC and LHC
• Azimuthal asymmetry of direct photons in intermediate energy heavy-ion collisions

Cited by in corpus (2)

• $\alpha$-clustering effect on flows of direct photons in heavy-ion collisions
• Effects of neutron-skin thickness on direct hard photon emission from reactions induced by the neutron-rich projectile ${}^{50}$Ca