Contributions of double-. delta. and other two-nucleon mechanisms to pionic pion production on the deuteron
Conference
·
OSTI ID:6125186
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)
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6125186
- Report Number(s):
- LA-UR-83-1397; CONF-830588-1; ON: DE83012666
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
645207* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. Greater than 1-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON RESONANCES
BARYONS
BORN APPROXIMATION
BOSONS
DELTA-1236 RESONANCES
DIRECT REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESON-BARYON INTERACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
N RESONANCES
NEUTRONS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PION-DEUTERON INTERACTIONS
PIONS
PIONS MINUS
PIONS PLUS
PROTONS
PSEUDOSCALAR MESONS
QUASI-FREE REACTIONS
RESCATTERING
RESONANCE PARTICLES
SCATTERING
Baryon No. Greater than 1-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON RESONANCES
BARYONS
BORN APPROXIMATION
BOSONS
DELTA-1236 RESONANCES
DIRECT REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MESON-BARYON INTERACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
N RESONANCES
NEUTRONS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PION-DEUTERON INTERACTIONS
PIONS
PIONS MINUS
PIONS PLUS
PROTONS
PSEUDOSCALAR MESONS
QUASI-FREE REACTIONS
RESCATTERING
RESONANCE PARTICLES
SCATTERING