Magnetic field effects on photon emission in intermediate energy heavy-ion collisions

. Photon production cross section in heavy-ion collisions is estimated by employing the elementary process of proton-neutron bremsstrahlung in a Boltzmann-Uehling-Uhlenbeck model. With taking the electromagnetic field into account for simulating the reactions, the magnetic effects are considered in different impact parameter regions for the collisions of 14 N + 208 Pb at incident energy of 40 MeV/nucleon in the laboratory system. We investigated the energy spectra, production rates, and the polar angular distributions of photons. In particular, the directed flow v 1 and elliptic flow v 2 are extracted for both photons and free nucleons. In contrast with unaffected nucleon flows by the magnetic field, photon flows do display magnetic field effect.