Investigation of high-Kstates in252No

In this paper we investigate the rotational band built upon a two-quasiparticle ${8}^{\ensuremath{-}}$ isomeric state of ${}^{252}$No up to spin ${I}^{\ensuremath{\pi}}$ $=$ ${22}^{\ensuremath{-}}$. The excited states of the band were populated with the ${}^{206}$Pb(${}^{48}\text{Ca},2n$) fusion-evaporation reaction. An unambiguous assignment of the structure of the ${8}^{\ensuremath{-}}$ isomer as a $7/{2}^{+}{[624]}_{\ensuremath{\nu}}\ensuremath{\bigotimes}9/{2}^{\ensuremath{-}}{[734]}_{\ensuremath{\nu}}$ 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 ${}^{250}$Fm support the interpretation of the same two-neutron quasiparticle structure as the bandhead in both $N=150$ isotones.