Exchange process amplitudes in coherent pion production

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.R5· OSTI ID:7061954

Deutchman, P A ^[1]; Erazmus, B ^[2]

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1. Physics Department, University of Idaho, Moscow, Idaho 83843 (United States)
2. Laboratoire de Physique Subatomique et des Technologies Associees, 2, rue de la Houssiniere, 44072 Nantes, Cedex 03 (France)

Calculations have been done that assess the importance of projectile-generated and target-generated pions for the exclusive reaction [sup 12]C+[sup 12]C[r arrow][sup 12]C(15.11 MeV)+[sup 12]C+[pi][sup 0] below and near threshold. Both the amplitude for [Delta] formation in the target with subsequent decay to [pi][sup 0]'s while simultaneously exciting the projectile to the [ital M]1 giant resonant state at 15.11 MeV, and the exchange process amplitude, in which the target and projectile exchange roles, are included in the calculations for the pion triple differential cross sections. For the first time, results of the pion energy and pion angular and ejectile angular distributions are shown with both amplitudes properly included. Also for the first time in this work, pion and ejectile distributions are shown in the laboratory frame after the appropriate relativistic transformations are performed. The projectile-generated pion amplitude is the major contributor to the pion energy and ejectile angular distribution; whereas, both amplitudes are equally important in the pion angular distribution and give rise to a unique signature for coherent pion production as seen in the c.m. frame.

• OSTI ID: 7061954
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 51:1; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANGULAR DISTRIBUTION
BOSONS
CARBON 12 REACTIONS
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COHERENT PRODUCTION
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
EXCHANGE INTERACTIONS
EXCLUSIVE INTERACTIONS
GIANT RESONANCE
HADRONS
HEAVY ION REACTIONS
INTERACTIONS
MESONS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RESONANCE
TARGETS