Many-body approach to hyperfine structure in the P2 state of lithium

Abstract

The Brueckner-Goldstone (BG) many-body perturbation theory has been applied in a calculation of the hyperfine structure (hfs) of lithium in the excited 1s22p(P2) state. This is the first complete calculation of hfs by the BG theory in a nonspherical system. Our result for a12 is 45.86 Mc/sec in excellent agreement with the experimental result of 46.17 ± 0.35 Mc/sec. In addition, we obtained the value a32=-2.79 Mc/sec for which no direct experimental result is currently available. The contributions from each of the magnetic hyperfine interactions and also the electric quadrupole moment interaction are presented. This approach also makes possible an analysis of the relative importance of various physical effects in each case. © 1969 The American Physical Society.