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• W2273672719 abstract "The results of an extensive search for the interactions of 1.5-Bev ${ensuremath{pi}}^{ensuremath{-}}$ mesons with nucleons in nuclear emulsion are given. By comparing the cross section for ${ensuremath{pi}}^{ensuremath{-}}ensuremath{-}P$ interactions in emulsion to the cross sections as measured by counters, it is deduced that half the ${ensuremath{pi}}^{ensuremath{-}}ensuremath{-}P$ collisions are collision of ${ensuremath{pi}}^{ensuremath{-}}$ with protons on the edge of a nucleus. Arguments are presented to indicate that the basic features of the ${ensuremath{pi}}^{ensuremath{-}}ensuremath{-}P$ interactions are not seriously disguised by the struck nucleons being in a nucleus.The elastic scattering seems to be largely diffraction scattering. Because of the large number of partial waves participating, it is not possible to interpret the differential elastic cross section unambiguously. However it seems certain that partial waves at least as high as the $F$ wave participate in the reactions. The angular distribution indicates that the $S$ and $P$ waves are either strongly absorbed or scattered or both. The data seems to be consistent with a nucleon model consisting of a core of about 0.5ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}13}$ cm radius plus a field extending out to about 1.0ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}13}$ cm.The inelastic collisions have the following features. The nucleons seem to go on the average into the backward hemisphere in the center-of-mass system after the collision. The more energetic of the two mesons usually goes into the forward hemisphere. The slower meson seems to be fairly closely correlated in angle with the nucleon. In the cases of ${ensuremath{pi}}^{0}$ production, the ${ensuremath{pi}}^{0}$ is the fast meson about one-half the time. The production of ${ensuremath{pi}}^{0}$ and ${ensuremath{pi}}^{+}$ in ${ensuremath{pi}}^{ensuremath{-}}ensuremath{-}P$ collisions seems to occur with about the same frequency.Also collisions are found which seem to be ${ensuremath{pi}}^{ensuremath{-}}ensuremath{-}N$ collisions. The production of an additional ${ensuremath{pi}}^{0}$ seems to be the most common process in these collisions. The ${ensuremath{pi}}^{ensuremath{-}}ensuremath{-}N$ collisions seem to be consistent with meson production occurring by means of the production of an excited nucleon in a $T=frac{3}{2}$ state which decays with the emission of a meson. The ${ensuremath{pi}}^{ensuremath{-}}ensuremath{-}P$ collisions do not seem to be consistent with such a process since the ratio of the number of ${ensuremath{pi}}^{+}$ to ${ensuremath{pi}}^{0}$ productions are not as predicted by theory. Also the $Q$ of decay of such an excited nucleon seems to vary from 50-350 Mev. This would indicate that the excited state lives for such a short time that it may not be a very useful concept.A short summary of the data on stars is also given." @default.
• W2273672719 created "2016-06-24" @default.
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• W2273672719 date "1955-06-01" @default.
• W2273672719 modified "2023-10-16" @default.
• W2273672719 title "π−-Nucleon Collisions at 1.5 Bev" @default.
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• W2273672719 doi "https://doi.org/10.1103/physrev.98.1416" @default.
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