π−Scattering from Complex Nuclei

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Abstract

Differential cross sections were measured for ${\ensuremath{\pi}}^{\ensuremath{-}}$-carbon scattering at 69.5 and 87.5 Mev and ${\ensuremath{\pi}}^{\ensuremath{-}}$-oxygen scattering at 87.5 Mev from 20\ifmmode^\circ\else\textdegree\fi{} to 125\ifmmode^\circ\else\textdegree\fi{} extending the technique of Baker, Rainwater, and Williams. The energy resolution was sufficient to measure pure elastic as well as 5- and 10-Mev inelastic cross sections. The modified Kisslinger optical-model equation was used to fit the elastic-cross-section data. A ${\ensuremath{\chi}}^{2}$ analysis for the 69.5-Mev carbon data gave a nuclear radius parameter ${r}_{0}=1.05\ifmmode\pm\else\textpm\fi{}0.02$ fermis and a fall-off parameter $t=1.16\ifmmode\pm\else\textpm\fi{}0.07$ fermis. These parameters give good fits to the other data as well. An energy dependence in the strength parameters for carbon is observed in qualitative agreement with prediction.

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