Direct observation of the Migdal effect induced by neutron bombardment
Theory For a gas mixture, the differential cross-section of Migdal effect from neutron–nucleus scattering in the soft limit is given by26,27,57 $$\frac{{{\rm{d}}}^{2}\sigma }{{\rm{d}}{E}_{{\rm{R}}}{\rm{d}}{E}_{{\rm{e}}}}=\sum _{i}\frac{{\rm{d}}{\sigma }_ …