Deep inelastic pion-induced nuclear reactions in the isobar model

Journal Article · Sat Dec 31 23:00:00 EST 1977 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.17.195· OSTI ID:5031789

Ginocchio, J N

Deep inelastic pion-induced nuclear reactions are calculated in the isobar model, which assumes that an interacting resonant pion and nucleon form an unstable particle, the ..delta.., which can propagate through the nucleus and either decay or be absorbed by interacting with other nucleons in the nucleus. The propagation of the particles is treated classically and the interactions are assumed to be incoherent. The lifetime of the ..delta.. is taken to be energy dependent as prescribed by measured pion-nucleon scattering and the cross section of the ..delta.. absorption is determined by measured pion production in two nucleon collisions. The formation of the ..delta.. by a pion and nucleon and the subsequent absorption of the ..delta.. provide a two-step mechanism for pion absorption. These calculations indicate that the pion is absorbed mostly on the inside forward edge of the nuclear surface where the nuclear density has almost reached central density. The calculations are compared with measured pion absorption cross scetions, proton spectra, and spallation products in pion-induced reactions. All of these data indicate that pion absorption is underestimated in this model by perhaps as much as 35%, particularly for low energy (approx.100 MeV) pions. Possible explanations for these discrepancies are discussed.

• Research Organization: Theoretical Division, Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico 87545
• OSTI ID: 5031789
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 17:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
BARYON RESONANCES
BARYONS
BINDING ENERGY
CASCADE THEORY
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DECAY
DEEP INELASTIC SCATTERING
ELEMENTARY PARTICLES
ENERGY
FERMIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INELASTIC SCATTERING
INTERACTIONS
ISOBAR MODEL
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MATHEMATICAL MODELS
MESON REACTIONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
N RESONANCES
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PION REACTIONS
PION-NUCLEON INTERACTIONS
RESONANCE PARTICLES
SCATTERING