A system was developed to locate the position of a laser on a CMOS camera with a accuracy of less than 20 µm. This is used to determine the location of particle tracks at the interface of two sub-detectors. This is ...

In an ultra peripheral collision with two gold ions, two virtual photons are exchanged, which excites the nuclei into a mutual giant dipole resonance (GDR) state. This excited state decays most often via neutron emission. ...

Ultra-peripheral collisions occur when nuclei pass one another without overlapping. The intense electric fields present can be treated as a flux of virtual photons; these photons can interact with the other nucleus or each ...