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- W235841676 abstract "In the deuteron, the simplest pion production mechanism is the quasifree process in which the pion is produced on a single nucleon, with the second nucleon acting as a spectator. More interesting mechanisms, however, are those in which both the nucleons are actively involved, as shown in Figs. 1b to 1d. In addition, there exist higher-order two-nucleon processes involving both ..pi..N and NN rescatterings. At T/sub ..pi../ > 250 MeV, there is evidence that the basic production could proceed via intermediate ..pi..N- and ..pi pi..-resonances, including the ..delta..(1232) resonance. Considering the fact that the ..pi..N rescattering can also proceed through the formation of a ..delta..(1232), we then have a situation in which two ..delta..(1232) can be simultaneously present. Recently, G.E. Brown et al. have proposed a double-..delta.. model to explain certain features of pion absorption by nuclei. It seems useful to further examine this mechanism by use of other nuclear reactions, such as the ..pi../sup -/d ..-->.. ..pi../sup +/..pi../sup -/nn reaction. In this report, we only briefly describe our calculations of the quasifree process and ..pi.. production followed by ..pi..N rescattering. We have also omitted the distortion of the incoming pion wave. This approximation should not affect our conclusion concerningmore » the relative importance of the two diagrams studied. (WHK)« less" @default.
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- W235841676 date "1983-01-01" @default.
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- W235841676 title "Contributions of double-. delta. and other two-nucleon mechanisms to pionic pion production on the deuteron" @default.
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