We study mutual dissociation of heavy nuclei in peripheral collisions at ultrarelativistic energies. Earlier this process was proposed for beam luminosity monitoring via simultaneous registration of forward and backward neutrons in zero degree calorimeters at Relativistic Heavy Ion Collider. Electromagnetic dissociation of heavy ions is considered in the framework of the Weizsäcker-Williams met...

The photoneutron reaction $^{181}\rm{Ta}(\gamma,3n)^{178m,g}\rm{Ta}$ was investigated with the beam from NSC KIPT electron linear accelerator LUE-40. measurements were performed using residual $\gamma$-activity method. bremsstrahlung flux-averaged cross-sections $\langle{\sigma(E_{\rm{\gamma max}})}\rangle$, max}})}\rangle_{\rm{m}}$, max}})}\rangle_{\rm{g}}$ and isomeric ratio of products $d(E_...