Helium ions from the interaction of 70-MeV pions with nuclei

A. Doron, A. Altman, D. Ashery, Y. Shamai, A. I. Yavin, J. Julien, Y. Cassagnou, H. E. Jackson, R. Legrain, A. Palmeri, S. Barbarino

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He ions emitted in the interaction of 70-MeV pions with carbon, aluminum, nickel, silver, and gold were measured directly at θ=90°. Cross sections and energy spectra are presented. Calculations of intranuclear cascades followed by evaporation reproduced the experimental data reasonably well. The results of the calculations imply that: (1) pion absorption in flight plays a major role in reactions in which α particles are emitted; and (2) one-"α"-removal lines, observed in deexcitation γ-ray experiments, do not imply large probability for real α emission. The π- to π+ ratio of cross sections was found to be about 1.4. NUCLEAR REACTIONS C, Al, Ni, Ag, Au (π-,α+anything), Eπ=70 MeV; measured He energy spectra; dσdΩ(90°). Natural targets; evaporation analysis.

Original languageEnglish
Pages (from-to)961-968
Number of pages8
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - 1978


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