The ${}_{}{}^{165}{}_{}{}^{}\mathrm{Ho}$ (α,t) and ${(}^3$He,d) reactions have been measured at beam energies of 40 and 25 MeV to look for the ${\mathit{K}}^{\mathrm{\pi }}$=$1^{+}${9/$2^{\mathrm{-}}$[514]-7/$2^{\mathrm{-}}$[523]} two-proton band structure in ${}_{}{}^{166}{}_{}{}^{}\mathrm{Er}$. Reaction products were analyzed using a quadrupole-three-dipole spectrometer. Distorted-wave Born approximation predictions were used to extract candidate states with angular momentum transfer l=5. The measured strengths of all the candidates for l=5 transitions were compared with the Nilsson fingerprint pattern of the ${\mathit{K}}^{\mathrm{\pi }}$=$1^{+}${9/$2^{\mathrm{-}}$[514]-7/$2^{\mathrm{-}}$[523]} band to identify the structure. No strong population of this configuration was found. At best two tentative candidates for the ${\mathit{I}}^{\mathrm{\pi }}$=$3^{+}$ and $4^{+}$ members of this band could be identified, which would represent at most 38% of the expected strength for this configuration. The bandhead for this tentative ${\mathit{K}}^{\mathrm{\pi }}$=$1^{+}$ excitation does not correspond to any ${\mathit{I}}^{\mathrm{\pi }}$=$1^{+}$ state observed in the ${}_{}{}^{166}{}_{}{}^{}\mathrm{Er}$(γ,γ’) reaction.

• Received 10 July 1992

DOI:https://doi.org/10.1103/PhysRevC.47.1943