Investigation of high-K states in No-252

In this paper we investigate the rotational band built upon a two-quasiparticle 8(-) isomeric state of No-252 up to spin I-pi = 22(-). The excited states of the band were populated with the Pb-206(Ca-48, 2n) fusion-evaporation reaction. An unambiguous assignment of the structure of the 8(-) isomer as a 7/2(+)624 circle times 9/2(-)734 configuration has been made on the basis of purely experimental data. Comparisons with triaxial self-consistent Hartree-Fock-Bogoliubov calculations using the D1S force and breaking time-reversal as well as z-signature symmetries are performed. These predictions are in agreement with present measurements. Mean-field calculations extended to similar states in Fm-250 support the interpretation of the same two-neutron quasiparticle structure as the bandhead in both N = 150 isotones.