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- W2044765623 abstract "The pion-production reactions π+A→π+π±A′ were studied on 2H, 12C, 40Ca, and 208Pb nuclei at an incident pion energy of Tπ+=283 MeV. Pions were detected in coincidence using the CHAOS spectrometer. The experimental results are reduced to differential cross sections and compared to both theoretical predictions and the reaction phase space. The composite ratio CππA between the π+π± invariant masses on nuclei and on the nucleon is also presented. Near the 2mπ threshold pion pairs couple to (ππ)I=J=0 when produced in the π+→π+π− reaction channel. There is a marked near-threshold enhancement of Cπ+π−A which is consistent with theoretical predictions addressing the partial restoration of chiral symmetry in nuclear matter. Furthermore, the behaviour of Cπ+π−A is well described when the restoration of chiral symmetry is combined with standard P-wave renormalization of pions in nuclear matter. On the other hand, nuclear matter only weakly influences Cπ+π+A, which displays a flat behaviour throughout the energy range regardless of A." @default.
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- W2044765623 date "2000-09-01" @default.
- W2044765623 modified "2023-10-01" @default.
- W2044765623 title "The ππ interaction in nuclear matter from a study of the πA→ππA′ reactions" @default.
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- W2044765623 doi "https://doi.org/10.1016/s0375-9474(00)00286-4" @default.
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