Study of Pion-Absorption Mechanisms in ${}^{4}{He}$ and Other Nuclei

The spectrum and yield of protons produced by 60-, 100-, and 200-MeV

π^{+}

and

π^{-}

beams on targets of

{}^{4}{He}

{}^{12}C

{}^{62}{Ni}

, and

{}^{181}{Ta}

have been measured at 45° and 90°. A distinct high-energy component is seen in the protons from

{}^{4}{He}

, which is consistent with a two-body absorption mechanism. Its cross section at 220 MeV is somewhat larger than calculated from the

π^{+}

+ D process. Possible evidence is also seen for multinucleon absorption modes. The data on heavier nuclei are consistent with earlier experiments.

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Study of Pion-Absorption Mechanisms inHe4and Other Nuclei