Abstract
The neutron total cross section of $^{204}\mathrm{Pb}$ was studied for neutron energies from 5 to 80 keV, using fast time-of-flight techniques. At least 10 $s$-wave resonances were observed in this interval in addition to a number of probable $p$-wave resonances. The average observed $s$-wave level spacing is 2.7\ifmmode\pm\else\textpm\fi{}0.5 keV, and the $s$-wave strength function is (0.55\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$. The total cross section of $^{208}\mathrm{Pb}$ was measured from 26 to 84 keV. Resonances were observed at about 70 and 77 keV, both apparently due to $l=1$ neutrons. The effective nuclear radius ${R}^{\ensuremath{'}}$ for $^{208}\mathrm{Pb}+n$ was found to be 8.4\ifmmode\pm\else\textpm\fi{}0.3 F.
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