Positron binding to atomic silver

Abstract

A frozen-core model of atomic silver is developed with the core consisting of the 1s to 4d shells. The model is validated by predictions of the electron affinity and binding energies of neutral Ag. The model predicts the existence of an electronically stable ground state of with a binding energy of and a spin-averaged annihilation rate of . The properties of a number of other positronic atoms are studied and it is seen that there is a general tendency for the annihilation rate to decrease as the ionization potential of the parent atom increases.