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- W2034014559 startingPage "2770" @default.
- W2034014559 abstract "Results are presented for the charge-symmetry superratio R, simple ratios ${mathit{r}}_{1}$ and ${mathit{r}}_{2}$, and the differential cross sections of ${mathrm{ensuremath{pi}}}^{+}$ and ${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$ elastic scattering on $^{3}mathrm{H}$ and $^{3}mathrm{He}$: R=${mathit{r}}_{1}$${mathit{r}}_{2}$, ${mathit{r}}_{1}$=ensuremath{sigma}(ensuremath{theta})[${mathrm{ensuremath{pi}}}^{+}$ $^{3}mathrm{ensuremath{pi}}^{+}$ $^{3}]$/ensuremath{sigma}(ensuremath{theta})[${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$ $^{3}mathrm{ensuremath{pi}}^{mathrm{ensuremath{-}}}$ $^{3}]$, and ${mathit{r}}_{2}$=ensuremath{sigma}(ensuremath{theta})[${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$ $^{3}mathrm{ensuremath{pi}}^{mathrm{ensuremath{-}}}$ $^{3}]$/ensuremath{sigma}(ensuremath{theta})[${mathrm{ensuremath{pi}}}^{+}$ $^{3}mathrm{He}$ ensuremath{rightarrow}${mathrm{ensuremath{pi}}}^{+}$ $^{3}]$. The measurements were made at ${mathit{T}}_{mathrm{ensuremath{pi}}}$=180 MeV and ${mathrm{ensuremath{theta}}}_{mathrm{ensuremath{pi}}}$(lab)=40ifmmode^circelsetextdegreefi{}--90ifmmode^circelsetextdegreefi{}; some data were obtained at ${mathit{T}}_{mathrm{ensuremath{pi}}}$=143 MeV also. At all angles, R>1 and ${mathit{r}}_{2}$>1 indicative of a violation of charge symmetry; however, we also find that ${mathit{r}}_{1}$ensuremath{simeq}1. Our data are consistent with ${mathit{F}}_{mathit{p}}$${(}^{3}$H)ensuremath{simeq}${mathit{F}}_{mathit{n}}$${(}^{3}$He) and ${mathit{F}}_{mathit{n}}$${(}^{3}$H)>${mathit{F}}_{mathit{p}}$${(}^{3}$He), where ${mathit{F}}_{mathit{p}}$ and ${mathit{F}}_{mathit{n}}$ are the proton and neutron matter form factors. ensuremath{sigma}(ensuremath{theta})[${mathrm{ensuremath{pi}}}^{ifmmodepmelsetextpmfi{}}$ $^{3}mathrm{ensuremath{pi}}^{ifmmodepmelsetextpmfi{}}$ $^{3}]$ decreases with increasing magnitude of the four-momentum transfer t up to ${mathrm{ensuremath{theta}}}_{mathrm{c}.mathrm{m}.}$ensuremath{simeq}70ifmmode^circelsetextdegreefi{}; the t dependence of the F 's is comparable to that of the electromagnetic form factors. ensuremath{sigma}(ensuremath{theta})[${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$ $^{3}mathrm{ensuremath{pi}}^{mathrm{ensuremath{-}}3}$H] has a non-spin-flip dip at ${mathrm{ensuremath{theta}}}_{mathrm{c}.mathrm{m}.}$ensuremath{simeq}78ifmmode^circelsetextdegreefi{}." @default.
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- W2034014559 date "1990-06-01" @default.
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- W2034014559 title "Superratio and the simple ratios ofπ+andπ−elastic scattering onH3andHe3at 180 MeV to investigate charge symmetry" @default.
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- W2034014559 doi "https://doi.org/10.1103/physrevc.41.2770" @default.
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