High spin states in ${}^{127}\mathrm{La}$ have been studied using the ${}^{32}\mathrm{S}{(}^{100}\mathrm{Mo},p4n)$ reaction at a beam energy of 155 MeV. Gamma rays were detected using the EUROBALL III spectrometer. One of the side bands in ${}^{127}\mathrm{La}$ is observed to be populated to a spin of ${\frac{83}{2}}^{+}.$ These data are compared with cranked Nilsson-Strutinski calculations which suggest that the structure is a smoothly terminating band, in valence space, based upon a $\pi \left[{(g}_{7/2}{d}_{5/2}{)}^5{(h}_{11/2}{)}^2\right]\otimes \nu \left[{(g}_{7/2}{d}_{5/2}{)}^{12}{(h}_{11/2}{)}^6{(d}_{3/2}{s}_{1/2}{)}^2\right]$ configuration, which can carry a maximum spin of $47.5ħ.$ This is the first identification of such a structure in this mass region.

• Received 21 September 1999

DOI:https://doi.org/10.1103/PhysRevC.61.021303