The rotational bands in the neutron-rich nuclei ${}^{153–157}\mathrm{Pm}$ are investigated by a particle-number-conserving method. The kinematic moments of inertia for the one-quasiparticle bands in odd-$A$ Pm isotopes ${}^{153,155,157}\mathrm{Pm}$ are reproduced quite well by the present calculation. By comparison between the experimental and calculated moments of inertia for the three two-quasiparticle bands in the odd-odd nuclei ${}^{154,156}\mathrm{Pm}$, their configurations and bandhead spins have been assigned properly. For the two-quasiparticle band in ${}^{154}\mathrm{Pm}$, the configuration is assigned as $\pi 5/2^{-}\left[532\right]\otimes \nu 3/2^{-}\left[521\right]$ ($K^{\pi }=4^{+}$) with the bandhead spin $I_0=4\hslash$. In ${}^{156}\mathrm{Pm}$, the same configuration and bandhead spin assignments have been made for the two-quasiparticle band with lower excitation energy. The configuration $\pi 5/2^{+}\left[413\right]\otimes \nu 5/2^{+}\left[642\right]$ ($K^{\pi }=5^{+}$) with the bandhead spin $I_0=5\hslash$ is assigned for that with higher excitation energy.

• Received 17 June 2019

DOI:https://doi.org/10.1103/PhysRevC.100.064307