Hyperfine structures and Land\'e $g_J$-factors for $n=2$ states in   beryllium-, boron-, carbon-, and nitrogen-like ions from relativistic   configuration interaction calculations
  Energy levels, hyperfine interaction constants, and Land\'e $g_J$-factors are reported for n=2 states in beryllium-, boron-, carbon-, and nitrogen-like ions from relativistic configuration interaction calculations. Valence, core-valence, and core-core correlation effects are taken into account through single and double-excitations from multireference expansions to increasing sets of active orbitals. A systematic comparison of the calculated hyperfine interaction constants is made with values from the available literature. 
S. Verdebout, C. Naz\'e, P. J\"onsson, P. Rynkun, M. Godefroid and G.   Gaigalas
physics.atom-ph