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• W1968011282 endingPage "970" @default.
• W1968011282 startingPage "957" @default.
• W1968011282 abstract "Angular distributions and excitation functions for inelastic scattering of ${ensuremath{pi}}^{+}$ and ${ensuremath{pi}}^{mathrm{ensuremath{-}}}$ from $^{14}mathrm{C}$ were measured at incident pion energies near the ${ensuremath{Delta}}_{33}$ resonance. Three states at excitation energies 11.7, 15.2, and 17.3 MeV were identified as ${4}^{mathrm{ensuremath{-}}}$ states. Isovector and isoscalar spectroscopic amplitudes ${Z}_{0}$ and ${Z}_{1}$, and equivalently, neutron and proton amplitudes ${Z}_{mathrm{n}}$ and ${Z}_{mathrm{p}}$ were deduced by comparison with microscopic distorted wave impulse approximation calculations. The 11.7-MeV state was found to be excited with a ${Z}_{mathrm{n}/{Z}_{mathrm{p}}}$ amplitude ratio of -1/3, resulting in a complete cancellation of the ${ensuremath{pi}}^{+}$ cross section. A nearly pure proton excitation was observed for the transition to the 17.3-MeV state. Both results are in qualitative agreement with the presented shell-model calculations. A poor correspondence with theory is found for the 15.2-MeV state. Data and distorted-wave impulse approximation calculations using shell-model wave functions are presented for the first ${3}^{mathrm{ensuremath{-}}}$ state at 6.73 MeV as an example of a transition dominated by ensuremath{Delta}S=0 (no spin transfer). Its excitation function and angular-distribution shape contrast sharply with the transitions to the ${4}^{mathrm{ensuremath{-}}}$ states that proceed by ensuremath{Delta}S=1." @default.
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• W1968011282 date "1985-03-01" @default.
• W1968011282 modified "2023-09-26" @default.
• W1968011282 title "Pion scattering to4−states inC14" @default.
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• W1968011282 doi "https://doi.org/10.1103/physrevc.31.957" @default.
• W1968011282 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9952606" @default.
• W1968011282 hasPublicationYear "1985" @default.
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