Levels in 165Ho populated in the 166Er(t, α) reaction

The 166Er(t, α)165Ho reaction has been studied using 17 MeV tritons with a polarization of ≈ 0.81 from the Los Alamos tandem Van de Graaff accelerator facility. The reaction products were momentum analyzed with a Q3D magnetic spectrometer and detected with a helicalcathode positionsensitive proportional counter. The analyzing powers were large, and the (t, α) reaction was found to be a very powerful technique for spin determinations in this mass region. The data also made it possible to give Nilsson model assignments for some levels for which previous information was conflicting or incomplete.