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- W2051299658 abstract "Liquid hydrogen, lithium, and copper targets were exposed to the Cosmotron 3-Bev external proton beam. Nuclear emulsion stacks were used to detect momentum-analyzed ${K}^{+}$ and ${ensuremath{pi}}^{+}$ mesons of momentum 280 Mev/c leaving the target at 0ifmmode^circelsetextdegreefi{} in the laboratory system. Correcting for decay in flight, the $frac{{ensuremath{pi}}^{+}}{{K}^{+}}$ ratios are (630ifmmodepmelsetextpmfi{}110), (290ifmmodepmelsetextpmfi{}48), and (304ifmmodepmelsetextpmfi{}50) for the respective hydrogen, lithium, and copper targets. The laboratory system differential cross sections for ${K}^{+}$ production are (4.8ifmmodepmelsetextpmfi{}1.0)ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}32}$, (3.5ifmmodepmelsetextpmfi{}0.7)ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}31}$, and (3.0ifmmodepmelsetextpmfi{}0.6)ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}30}$ ${mathrm{cm}}^{2}$/sterad Mev per hydrogen, lithium, and copper nucleus respectively. Assuming a ${K}^{+}$ energy dependence proportional to the final state density (energy independent matrix element) the integrated ${K}^{+}$ production cross sections are 0.21, 1.7, and 14.7 mb for hydrogen, lithium, and copper. For a matrix element proportional to the ${K}^{+}$ momentum in the center of mass and assuming a ${cos}^{2}ensuremath{theta}$ distribution the $pensuremath{-}p$ cross section also happens to be 0.21 mb. The $frac{ensuremath{pi}}{K}$ ratios indicate that ${K}^{+}$ production by $pensuremath{-}p$ is not suppressed significantly relative to that by $p$-nucleus and that the Li to Cu $Z$-dependence of ${K}^{+}$ production appears the same as for ${ensuremath{pi}}^{+}$ production. Our integrated cross sections suggest that strange particle production by 3-Bev protons occurs ensuremath{sim}1% of the time." @default.
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- W2051299658 date "1957-12-01" @default.
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- W2051299658 title "Production Cross Sections ofK+Mesons by 3-Bev Protons on H, Li, and Cu" @default.
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- W2051299658 doi "https://doi.org/10.1103/physrev.108.1322" @default.
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