In the reactions 191Ir( 12C, 5n) 198Bi and 193Ir( 12C, 5n) 200Bi isomeric states were observed with half-lives T 1 2 = 7.7±0.5 s and T 1 2 = 0.40±0.05 s , respectively, which are ascribed to the 10 − states with a configuration π( h 9 2 ) 1{v}( i 13 2 ) −1 . In 200Bi a second isomeric level T 1 2 = 46±4 ns was found.