Contributions of double-. delta. and other two-nucleon mechanisms to pionic pion production on the deuteron

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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 ... continued below

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Pages: 8

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Liu, L.C.; Bhalerao, R.S. & Piasetzky, E. January 1, 1983.

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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 concerning the relative importance of the two diagrams studied. (WHK)

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Pages: 8

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NTIS, PC A02/MF A01.

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  • Delta-Nucleus dynamics symposium, Argonne, IL, USA, 2 May 1983

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  • Other: DE83012666
  • Report No.: LA-UR-83-1397
  • Report No.: CONF-830588-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6125186
  • Archival Resource Key: ark:/67531/metadc1109950

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  • January 1, 1983

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  • Feb. 22, 2018, 7:45 p.m.

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  • May 22, 2018, 12:20 p.m.

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Liu, L.C.; Bhalerao, R.S. & Piasetzky, E. Contributions of double-. delta. and other two-nucleon mechanisms to pionic pion production on the deuteron, article, January 1, 1983; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1109950/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.