Abstract
534 interactions of 7.3 GeV negative pions in an emulsion stack have been studied. Average multiplicities of heavy prongs and shower particles were obtained. Individual Lorentz factorsγc were computed for 395 showers withns⩾3. A detailed study is made of theγc-spectrum of events from light nuclei. This spectrum appears structured into head-on collisions with one or two nucleons and peripheric collisions involving one or two pions in the struck nucleon’s meson cloud. Pion-pion collisions show a marked « two-centre » structure, attributed tentatively to the formation and isotropic two pion decay of pionic resonant (isobaric) states of mass ∼3 μ. The e−-e+-pair spectrum from π0-decay has been measured and yields an average inelasticity of ∼ 75% in π−-nucleus collisions.
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