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• W1645707584 endingPage "1091" @default.
• W1645707584 startingPage "1074" @default.
• W1645707584 abstract "The reactions $^{3}mathrm{He}$(${mathrm{ensuremath{pi}}}^{+}$,pp)p and $^{3}mathrm{He}$(${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$,pn)n were studied at 37.0 MeV by coincidence detection of two nucleons. The differential cross sections were separated to two-nucleon (${mathrm{ensuremath{sigma}}}_{2mathit{N}}$), three-nucleon (${mathrm{ensuremath{sigma}}}_{3mathit{N}}$), and final-state interaction (${mathrm{ensuremath{sigma}}}_{mathrm{FSI}}$) components. For ${mathrm{ensuremath{pi}}}^{+}$, the ${mathrm{ensuremath{sigma}}}_{2mathit{N}}$ angular distribution is symmetric about 90ifmmode^circelsetextdegreefi{}, and the total cross section is 1.5 times the cross section measured for d(${mathrm{ensuremath{pi}}}^{+}$,pp). For ${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$, the angular distribution is asymmetric (backward peaked). The asymmetry increases with decreasing energy, indicating increasing pion s-wave contribution at lower energies. The fraction of the cross section induced by s-wave pions as calculated by a partial wave amplitude analysis is 13%. The measured total cross sections are ${mathrm{ensuremath{sigma}}}_{2mathit{N}}$(${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$)=0.85ifmmodepmelsetextpmfi{}0.08 mb and ${mathrm{ensuremath{sigma}}}_{2mathit{N}}$(${mathrm{ensuremath{pi}}}^{+}$)=7.9ifmmodepmelsetextpmfi{}0.5 mb; ${mathrm{ensuremath{sigma}}}_{3mathit{N}}$(${mathrm{ensuremath{pi}}}^{mathrm{ensuremath{-}}}$)=1.6ifmmodepmelsetextpmfi{}0.7 mb and ${mathrm{ensuremath{sigma}}}_{3mathit{N}}$(${mathrm{ensuremath{pi}}}^{+}$)=1.3ifmmodepmelsetextpmfi{}0.3 mb. A new evaluation of ${mathrm{ensuremath{sigma}}}_{3mathit{N}}$ at ${mathit{T}}_{mathrm{ensuremath{pi}}}$=62.5 and 82.8 MeV is given, using data from an earlier experiment. The cross sections leading to the two-nucleon final-state interaction at ${mathit{T}}_{mathrm{ensuremath{pi}}}$=37.0 MeV are also estimated. textcopyright{} 1996 The American Physical Society." @default.
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• W1645707584 date "1996-03-01" @default.
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• W1645707584 title "Pion absorption on<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>at low energies" @default.
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• W1645707584 doi "https://doi.org/10.1103/physrevc.53.1074" @default.
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