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Pion production in nuclear collisions with Fermi motion effects

Journal Article · · Phys. Rev., C; (United States)
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The independent multiple collision model for pion production in nuclear collisions is extended to include the effects of Fermi motion. We have developed an analytic expression for the distribution of invariant mass for colliding nucleons whose momentum distributions are in relative motion. This expression is tractable if the colliding distributions are described in terms of Gaussian functions. We make use of this formalism to calculate Fermi averaged cross sections for pion production, using as input multi-Gaussian fits to momentum distributions obtained from nuclear structure calculations. We have calculated charged pion multiplicity distributions and inclusive cross sections for proton-nucleus and nucleus-nucleus collisions. We use a phenomenological method for incorporating the effects of energy loss by participant nucleons and pion reabsorption. Sample calculations are presented and compared with available experimental data. We discuss the striking effect of Fermi motion on pion production at bombarding energies below the nucleon-nucleon pion production threshold.

Research Organization:
Ames Laboratory: United States Department of Energy and Department of Physics, Iowa State University, Ames, Iowa 50011
OSTI ID:
6089338
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:2; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
653007 -- Nuclear Theory-- Nuclear Models-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
ELEMENTARY PARTICLES
ENERGY LOSSES
FERMI INTERACTIONS
FIREBALLS
GAUSSIAN PROCESSES
HADRON-HADRON INTERACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LOSSES
MESONS
MULTIPLE SCATTERING
MULTIPLICITY
NUCLEAR FIREBALLS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PIONS
PSEUDOSCALAR MESONS
SCATTERING
THERMODYNAMICS
WEAK INTERACTIONS