Azimuthal asymmetry of direct photons in intermediate energy heavy-ion collisions

Abstract

Hard photon emitted from energetic heavy ion collisions is of very interesting since it does not experience the late-stage nuclear interaction, therefore it is useful to explore the early-stage information of matter phase. In this work, we have presented a first calculation of azimuthal asymmetry, characterized by directed transverse flow parameter $F$ and elliptic asymmetry coefficient $v_2$, for proton-neutron bremsstrahlung hard photons in intermediate energy heavy-ion collisions. The positive $F$ and negative $v_2$ of direct photons are illustrated and they seem to be anti-correlated to the corresponding free proton's flow.

7 pages, 4 figures; accepted by Physics Letters B

References in corpus (4)

• Transverse momentum analysis of collective motion in relativistic nuclear collisions
• Scaling of Anisotropic Flow and Momentum-Space Densities for Light Particles in Intermediate Energy Heavy Ion Collisions
• Scaling of anisotropy flows in intermediate energy heavy ion collisions
• Differential cross section for neutron-proton bremsstrahlung

Cited by in corpus (8)

• $\alpha$-clustering effect on flows of direct photons in heavy-ion collisions
• Imprints of high-momentum nucleons in nuclei on hard photons from heavy-ion collisions around the Fermi Energy
• The interplay of short-range correlations and nuclear symmetry energy in hard photon productions from heavy-ion reactions at Fermi energies
• Testing the phase transition parameters inside neutron stars with the production of protons and lambdas in relativistic heavy-ion collisions
• Hard photon flow and photon-photon correlation in intermediate energy heavy-ion collisions
• Effects of neutron-skin thickness on direct hard photon emission from reactions induced by the neutron-rich projectile ${}^{50}$Ca
• Direct photon emission and influence of dynamical wave packets in an extended quantum molecular dynamics model
• Azimuthal anisotropy and multiplicities of hard photons and free nucleons in intermediate-energy heavy-ion collisions