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- W64740670 startingPage "1219" @default.
- W64740670 abstract "The reaction ${ensuremath{pi}}^{ensuremath{-}}+pensuremath{rightarrow}ensuremath{omega}+n$ at 1.2 $frac{mathrm{BeV}}{c}$ was detected by counter techniques. Recoil neutrons were detected in a scintillation counter array at ${ensuremath{theta}}_{n}={20}^{ensuremath{circ}}ifmmodepmelsetextpmfi{}{2}^{ensuremath{circ}}$, and their velocity determined by a time-of-flight measurement. Measurement of the neutron direction and velocity determined the $ensuremath{omega}$ mass with resolution ifmmodepmelsetextpmfi{}15 MeV, and enabled separation of $ensuremath{omega}$ production from background. Scintillation counters surrounding the hydrogen target distinguished charged from neutral $ensuremath{omega}$ decays, yielding a branching ratio: $frac{{ensuremath{Gamma}}_{mathrm{neutral}}}{{ensuremath{Gamma}}_{mathrm{charged}}}=0.124ifmmodepmelsetextpmfi{}0.021$. Neutral $ensuremath{omega}$ decays were directly observed by conversion of the resulting $ensuremath{gamma}$ rays in a leadplate spark-chamber array. Events with three observed $ensuremath{gamma}$'s were fitted to the decay $ensuremath{omega}ensuremath{rightarrow}{ensuremath{pi}}^{0}+ensuremath{gamma}ensuremath{rightarrow}3ensuremath{gamma}$ (a two-constraint fit). Twenty-six fits with ${ensuremath{chi}}^{2}<5$ were found, of which five are estimated to be background. If $ensuremath{omega}ensuremath{rightarrow}{ensuremath{pi}}^{0}+ensuremath{gamma}$ is the only neutral mode, then we expect 29 observed ${ensuremath{pi}}^{0}ensuremath{gamma}$ decays, as calculated from the recoil-neutron measurements and spark-chamber efficiency. Thus our data give clear evidence that the mode $ensuremath{omega}ensuremath{rightarrow}{ensuremath{pi}}^{0}+ensuremath{gamma}$ represents a substantial fraction (consistent with 100%) of the $ensuremath{omega}$ neutral decays." @default.
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- W64740670 date "1967-07-25" @default.
- W64740670 modified "2023-09-27" @default.
- W64740670 title "Neutral Decay of theωMeson" @default.
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- W64740670 doi "https://doi.org/10.1103/physrev.159.1219" @default.
- W64740670 hasPublicationYear "1967" @default.
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