High-spin states in ${}^{162}$Lu and ${}^{164}$Lu have been studied by means of in-beam $\gamma$-ray spectroscopy techniques using the multidetector array GASP. The excited states have been populated through the ${}^{139}\mathrm{La}{(}^{28}\mathrm{Si}{,5n)}^{162}$Lu and ${}^{139}\mathrm{La}{[}^{29\left(30\right)\mathrm{}}\mathrm{Si},4\mathrm{}\left(5\right)n{]}^{164}$Lu reactions. Level schemes were constructed for both nuclei. Configurations for the rotational bands have been discussed. Alignments, band crossing frequencies, and $B\left(M1\mathrm{}\right)/B\left(E2\mathrm{}\right)\mathrm{}$ ratios have been analyzed in the framework of the cranking model. The systematic evolution of the signature inversion in the $\pi h_{11/2}\otimes \nu i_{13/2}$ structure is reviewed.

• Received 4 February 1997

DOI:https://doi.org/10.1103/PhysRevC.56.707