RELATIVISTIC-CONFIGURATION-INTERACTION RESULTS FOR THE HYPERFINE-STRUCTURE CONSTANTS OF CS-133-II AND BA-137-III 5P(5)(5D+6S+6P) LEVELS

Relativistic configuration interaction hyperfine constants (HFC) have been obtained for all 5p(5)(5d+6s+6p) Cs-133 II levels. The 22 magneti c dipole constants, A, agree with experiment to 12% or better for all but three levels. Many of the odd J=1,2 levers, which include these th ree, exhibit large many body effects. Our values for the quadrupole HF S constants are considerably smaller than the few highly uncertain exp erimental values, which we believe need remeasurement. There are also significant many body results present in the lowest Ba-137 III odd par ity J=1,2 levels; here, there are no experimental results available. W e have found certain excitations from the 4d subshell to be important; we ascribe this to the presence of an open 5p subshell.