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Direct hard photon emissions from incoherent proton-neutron bremsstrahlung incollisions of the neutron-rich projectile $^{50}$Ca with $^{12}$C and $^{40}$Catargets are simulated in the framework of the isospin-dependent quantummolecular dynamics (IQMD) model. By adjusting the diffuseness parameter ofneutron density in the droplet model to obtain different neutron skinthicknesses for $^{50}$Ca, the effects of neutron skin thickness on direct hardphoton emission are investigated via several probes. The results show that moredirect hard photons are produced with increasing neutron skin thickness inperipheral collisions. Meanwhile, we find that the multiplicity yield ratio$R_{cp}(\sigma_{\gamma})$ between central collisions and peripheral collisionsas well as the rapidity dependence of multiplicity for direct hard photons aresensitive to neutron skin thickness. The results indicate that direct hardphoton emission can be taken as an experimental observable to extractinformation on neutron skin thickness.

Effects of neutron-skin thickness on direct hard photon emission from reactions induced by the neutron-rich projectile $^{50}$Ca