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- W1608698895 startingPage "2111" @default.
- W1608698895 abstract "A twenty-atmosphere hydrogen-filled diffusion cloud chamber located in a magnetic field of 10 500 gauss was exposed to a beam of 1.9-Bev ${ensuremath{pi}}^{ensuremath{-}}$ mesons from the Brookhaven Cosmotron. Out of 20 000 pictures taken of the chamber there are two examples of $V$-particle production in the gas of the chamber, and 78 examples of decays of $V$ particles which were presumably produced in the stainless steel walls of the chamber. One of the production events in the gas of the chamber is best interpreted as ${ensuremath{pi}}^{ensuremath{-}}+pensuremath{rightarrow}{ensuremath{Lambda}}^{0}+{K}^{0}+{ensuremath{pi}}^{0}$, while the other is an example of ${ensuremath{pi}}^{ensuremath{-}}+pensuremath{rightarrow}{ensuremath{Sigma}}^{ensuremath{-}}+{K}^{+}$. The 63 neutral decays observed include 28 identified ${ensuremath{Lambda}}^{0}$ particles and 11 identified ${ensuremath{theta}}^{0}$ particles. Momentum and angular distributions for the ${ensuremath{Lambda}}^{0}$ and ${ensuremath{theta}}^{0}$ particles were obtained. Six of the ${V}^{0}$ decays, or about 10%, were classified as anomalous. Of these, three seemed to represent the $ensuremath{beta}$ decay of neutral $V$ particles into ${ensuremath{pi}}^{ifmmodepmelsetextpmfi{}}+{e}^{ensuremath{mp}}+ensuremath{nu}$. From the data on neutral $V$-particle decays the mean lifetime of the ${{ensuremath{theta}}_{2}}^{0}$ was qualitatively measured as being probably between ${10}^{ensuremath{-}9}$ and ${10}^{ensuremath{-}8}$ sec. The cross section for $V$-particle production by 1.9-Bev ${ensuremath{pi}}^{ensuremath{-}}$ mesons on protons is estimated to be ensuremath{sim}1 mb. Some evidence was found which suggests the existence of a heavy cascade $K$ meson which decays into a conventional $K$ meson and a pion." @default.
- W1608698895 created "2016-06-24" @default.
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- W1608698895 date "1958-03-15" @default.
- W1608698895 modified "2023-09-24" @default.
- W1608698895 title "V-Particle Production by 1.9-Bevπ−Mesons" @default.
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- W1608698895 doi "https://doi.org/10.1103/physrev.109.2111" @default.
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