  Some binding-energy-related quantities serving as effective order parameters
have been used to analyze the shape phase transition in the odd Sm nuclei. It
is found that the signals of phase transition in the odd Sm nuclei are greatly
enhanced in contrast to the even Sm nuclei. A further analysis shows that the
transitional behaviors related to pairing in the Sm nuclei can be well
described by the mean field plus pairing interaction model, with a monotonic
decrease in the pairing strength $G$.
