K p 5 4 2 isomers and their rotational bands in

The half-life of the known I,Kp=4−,4− state in 170Er has been measured to be 42.8±1.7 ns. The rotational band built on this isomer was excited inelastically up to spin 18− by a 238U beam at Elab=1358 MeV. A similar band in 168Er was extended to spin 15−. The wave function of the isomeric state in 170Er has been determined from the measured ugK−gRu values, which were deduced from the intensity ratios of the DI=1 to DI=2 transitions within the band. The dominant component consists of a two-quasiproton configuration involving the Nilsson orbits 7/2−f523g and 1/2+f411g. In contrast, the two-quasineutron configuration involving the 7/2+f633g and 1/2−f521g Nilsson orbits constitutes the major component for the wave function of the Kp=4− isomer in 168Er.