Nuclear structure of ${}_{}{}^{170}{}_{}{}^{}\mathrm{Tm}$ from neutron-capture and (d,p)-reaction measurements

We have made experimental measurements in ${}_{}{}^{170}{}_{}{}^{}\mathrm{Tm}$ of the following: secondary γ rays, conversion electrons, and γ-γ coincidences from thermal neutron capture in ${}_{}{}^{169}{}_{}{}^{}\mathrm{Tm}$, primary γ rays from average resonance capture with 2-keV and 24-keV neutron beams, and proton spectra from the (d,p) reaction on ${}_{}{}^{169}{}_{}{}^{}\mathrm{Tm}$. From these data and those of previous investigations, we have identified more than 130 excited levels in ${}_{}{}^{170}{}_{}{}^{}\mathrm{Tm}$ below 1550 keV. Of these, 62 (with connecting transitions) are placed in 18 rotational bands with assigned Nilsson configurations. These results are in good agreement with a semiempirical modeling of ${}_{}{}^{170}{}_{}{}^{}\mathrm{Tm}$ level structure. Values for seven Gallagher-Moszkowski splittings and four Newby shifts have been obtained. These matrix elements show remarkably good agreement with calculation. Among the observed ${\mathit{K}}^{\mathrm{\pi }}$=$1^{\mathrm{-}}$ and $2^{\mathrm{-}}$ rotational bands, configuration mixing appears to play a significant role. © 1996 The American Physical Society.