Many-Body Effects in Hyperfine Interactions in $^{205}$Pb$^+$
  Ab initio calculations have been carried out to study the magnetic dipole and electric quadrupole hyperfine structure constants of $^{205}$Pb$^+$. Many-body effects have been considered to all orders using the relativistic coupled-cluster theory in the singles, doubles and partial triples approximation. The trends of these effects are found to be different from atomic systems that have been studied earlier. 
Sonjoy Majumder, B. K. Sahoo, R. K. Chaudhuri, B. P. Das and D.   Mukherjee