Pion production: A probe for coherence in medium-energy heavy-ion collisions

Journal Article · Tue Apr 01 04:00:00 EST 1986 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.33.1420· OSTI ID:5872690

Stachel, J; Braun-Munzinger, P; Freifelder, R H; Paul, P; Sen, S; DeYoung, P; Zhang, P H; Awes, T C; Obenshain, F E; Plasil, F

The production of neutral pions has been studied in reactions of 35 MeV/nucleon /sup 14/N+ /sup 27/Al,Ni,W and 25 MeV/nucleon /sup 16/O+ /sup 27/Al,Ni. Inclusive pion differential distributions dsigma/dT/sub ..pi../, dsigma/d..cap omega.., dsigma/dy, dsigma/dp/sub perpendicular/, and d/sup 2/sigma/dy dp/sub perpendicular/ have been measured by detecting the two pion-decay ..gamma.. rays in a setup of 20 lead glass Cerenkov detector telescopes. Special care was taken to understand and suppress background events. Effects of pion reabsorption are discussed and it is found that the cross sections presented here are substantially affected by such final state interactions. The comparatively large experimental cross sections and the shape of the spectral distributions cannot be accounted for in single nucleon-nucleon collision or statistical models; they rather call for a coherent pion production mechanism.

• Research Organization: Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5872690
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 33:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651425* -- Nuclear Properties & Reactions
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Experimental-- Nuclear Reactions & Scattering-- (-1987)
653007 -- Nuclear Theory-- Nuclear Models-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
ANGULAR DISTRIBUTION
BOSONS
CHARGED-PARTICLE REACTIONS
CHERENKOV COUNTERS
COHERENT PRODUCTION
COINCIDENCE SPECTROMETRY
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
GAMMA RADIATION
HADRONS
HEAVY ION REACTIONS
INCLUSIVE INTERACTIONS
INTERACTIONS
IONIZING RADIATIONS
MATHEMATICAL MODELS
MATHEMATICAL SPACE
MEASURING INSTRUMENTS
MESONS
METALS
MEV RANGE
MEV RANGE 100-1000
NICKEL
NITROGEN 14 REACTIONS
NUCLEAR REACTIONS
OXYGEN 16 REACTIONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHASE SPACE
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RADIATIONS
SPACE
STATISTICAL MODELS
TARGETS
TRANSITION ELEMENTS
TUNGSTEN