Abstract
The $p,n$ reaction on targets of $^{197}\mathrm{Au}$, $^{206}\mathrm{Pb}$, $^{207}\mathrm{Pb}$, $^{208}\mathrm{Pb}$, $^{209}\mathrm{Bi}$, and $^{232}\mathrm{Th}$ has been studied to obtain the widths, reaction $Q$ values, and selected cross sections of the isobaric analog of the ground state of these targets. Widths obtained are, respectively, 116 \ifmmode\pm\else\textpm\fi{} 35, 175 \ifmmode\pm\else\textpm\fi{} 25, 192 \ifmmode\pm\else\textpm\fi{} 25, 235 \ifmmode\pm\else\textpm\fi{} 35, 257 \ifmmode\pm\else\textpm\fi{} 35, and 273 \ifmmode\pm\else\textpm\fi{} 30 keV assuming a Breit-Wigner line shape for the analog resonance. These results support the disagreement of previous $p,n$ measurements with $p,n\overline{p}$ measurements for the widths of $^{209}\mathrm{Pb}$ and $^{209}\mathrm{Bi}$. Results are shown to be sensitive to choice of resonance line shape and provide a possible explanation for discrepancies between $p,n$ and $p,n\overline{p}$ measurements. The need for a more precise theoretical understanding of the structure of unbound analog resonances is indicated.
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