We analyze scattering cross sections at and near third-order exceptional points (EP3), i.e., points in physical parameter space where three energies and eigenfunctions coincide. At an EP3, the Green’s function contains a pole of third order, in addition to poles of second and first order. We show that the interference of the three pole terms produces a rich variety of line shapes at the excepti...

The triple to double coincidence ratio (TDCR) liquid scintillation measurement technique is commonly used in national metrology institutes (NMIs) perform standardization of pure beta emitters. LNE-LNHB historical device, RCTD1, a quite large which has been developed and over the past 30 years with its associated electronics for measurements various radionuclides. During last 4 two new portable ...