Ab initio determination of the lifetime of the $6^2P_{3/2}$ state f or   $^{207}Pb^+$ by relativistic many-body theory
  Relativistic coupled-cluster(RCC) theory has been employed to calculate the life time of the $6 ^2P_{3/2}$ state of single ionized lead($^{207}Pb$) to an accurac y of 3% and compared with the corresponding value obtained using second order r elativistic many-body perturbation theory(RMBPT). This is one of the very few ap plications of this theory to excited state properties of heavy atomic systems. C ontributions from the different electron correlation effects are given explicitl y. 
Bijaya K. Sahoo, Sonjoy Majumder, Rajat K. Chaudhuri, B.P. Das and   Debashis Mukherjee