High-spin level spectra of the nucleiPb195,Pb197,Pb199, andPb201

The level structures of the light lead nuclei ${}_{}{}^{195}{}_{}{}^{}\mathrm{Pb}$, ${}_{}{}^{197}{}_{}{}^{}\mathrm{Pb}$, ${}_{}{}^{199}{}_{}{}^{}\mathrm{Pb}$, and ${}_{}{}^{201}{}_{}{}^{}\mathrm{Pb}$ have been studied by in-beam $\gamma$-ray spectroscopy in bombardments of isotopically enriched HgO targets with ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ ions. The measurements included $\gamma$-ray singles, comprehensive ($\gamma \gamma t$) coincidences, half-life determinations, and $\gamma$-ray angular distributions. High-spin level spectra above previously known ${13/2}^{+}$ isomers are reported for the four nuclei, and are interpreted in terms of the weak coupling of an $i_{\frac{13}{2}}$ neutron hole to established states of the adjacent even-$A$ core nuclei.