Abstract
The thermal-neutron-capture $\ensuremath{\gamma}$-ray spectra from natural Pb and enriched ${\mathrm{Pb}}^{207}$ have been studied with a 20-${\mathrm{cm}}^{3}$ Ge(Li) detector. A careful comparison of these spectra reveals the existence of two weak $\ensuremath{\gamma}$-ray cascades (intensity \ensuremath{\cong} ${10}^{\ensuremath{-}3}$ times the intensity of the primary transition to the ${\mathrm{Pb}}^{208}$ ground state) from the neutron-capture state to the ${\mathrm{Pb}}^{208}$ ground state. These cascades have energies 4753.7-2614.0 keV and 3283.3-4086.0 keV and pass through the first excited ${3}^{\ensuremath{-}}$ state at 2614.0 keV and a ${2}^{+}$ state at 4086.0 keV, respectively. The neutron separation energy of ${\mathrm{Pb}}^{208}$ was measured to be 7367.7 \ifmmode\pm\else\textpm\fi{} 0.7 keV.
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