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The rotational bands in the neutron-rich nuclei $^{153-157}$Pm areinvestigated by a particle-number conserving method. The kinematic moments ofinertia for the 1-quasiparticle bands in odd-$A$ Pm isotopes $^{153, 155,157}$Pm are reproduced quite well by the present calculation. By comparisonbetween the experimental and calculated moments of inertia for the three2-quasiparticle bands in the odd-odd nuclei $^{154, 156}$Pm, theirconfigurations and bandhead spins have been assigned properly. For the2-quasiparticle band in $^{154}$Pm, the configuration is assigned as$\pi5/2^-[532]\otimes \nu3/2^-[521]$ ($K^\pi=4^+$) with the bandhead spin$I_0=4\hbar$. In $^{156}$Pm, the same configuration and bandhead spinassignments have been made for the 2-quasiparticle band with lower excitationenergy. The configuration $\pi5/2^+[413]\otimes \nu5/2^+[642]$ ($K^\pi=5^+$)with the bandhead spin $I_0=5\hbar$ is assigned for that with higher excitationenergy.

Configuration and bandhead spin assignments for the 2-quasiparticle rotational bands in the neutron-rich nuclei $^{154, 156}$Pm