Hyperfine induced effects on the angular distribution of the dielectronic hypersatellite line

We investigate the dielectronic recombination (DR) of an electron and a highly-charged ion with non-zero nuclear spin. We assume that the incident electron is captured into doubly-excited 1 s 2 κ κ ′ J = 0 , 1 , 2 levels of Be-like ions just above of its autoionization threshold. The angular distribution of the subsequent radiative emission is investigated especially for its dependence upon the nuclear spin and the nuclear magnetic moment. While the hyperfine and even the fine-structure of the ions cannot be resolved in typical DR experiments, we found the photon angular distribution, following the decay of the 1 s 2 2 p 3 / 2 ns J = 1 , 2 DR resonance very sensitive to the nuclear parameters.