Abstract
Motivated by new experimental spectra in transfermium mass region, we have investigated broken-pair high-$K$ multiparticle excited states and their rotational bands for the $N=150$ isotones around $Z=100$, by using the configuration-constrained pairing-deformation-frequency self-consistent total-Routhian-surface (TRS) model. In order to avoid the spurious phase transition encountered in the Bardeen-Copper-Schrieffer (BCS) pairing, the particle-number-conserving method has been employed for pairing calculations. Pairing correlations are remarkably reduced for the rotations of broken-pair multiparticle states. The present configuration-constrained TRS calculations reproduce reasonably existing experimental data. The abnormal feature in the recently observed ${K}^{\ensuremath{\pi}}={8}^{\ensuremath{-}}$ bands of $^{252}\mathrm{No}$ and $^{250}\mathrm{Fm}$ would be associated with configuration mixing.
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