Bremsstrahlung from Relativistic Heavy Ions in a Fixed Target Experiment at the LHC

摘要

We calculate the emission of bremsstrahlung from lead and argon ions in ultraperipheral collisions in a fixed target experiment (AFTER) that uses the LHC beams. With nuclear charges of Ze equal to 82e and 18e, respectively, these ions are accelerated to energies of 7 Tev x Z. The bremsstrahlung peaks around approximate to 100GeV and the spectrum exposes the nuclear structure of the incoming ion. The peak structure is significantly different from the flat power spectrum pertaining to a point charge. Photons are predominantly emitted within an angle of 1/gamma to the direction of ion propagation. Our calculations are based on the Weizsacker-Williams method of virtual quanta with application of existing experimental data on photonuclear interactions.