Strong Coulomb effects on pions produced in heavy ion collisions

Journal Article · Mon Mar 01 04:00:00 UTC 1982 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.25.1499· OSTI ID:5524336

Sullivan, J P; Bistirlich, J A; Bowman, H R; Bossingham, R; Buttke, T; Crowe, K M; Frankel, K A; Martoff, C J; Miller, J; Murphy, D L; Rasmussen, J O; Zajc, W A; Hashimoto, O; Koike, M; Peter, J; Benenson, W; Crawley, G M; Kashy, E; Nolen, Jr, J A

Doubly differential cross sections for the production of ..pi../sup +/ and ..pi../sup -/ near the velocity of the incident beam for pion laboratory angles from 0 to 20 degrees are presented. Beams of /sup 20/Ne with E/A = 280, 380, and 480 MeV and /sup 40/Ar with E/A = 535 MeV incident on C, NaF, KCl, Cu, and U targets were used. A sharp peak in the ..pi../sup -/ spectrum and a depression in the ..pi../sup +/ spectrum is observed at 0/sup 0/ near the incident projectile velocity. The effect is explained in terms of Coulomb interactions between pions and fragments of the incident beam. Least squares fits to the data using the Coulomb correction formulas of Gyulassy and Kauffmann and an effective projectile fragment charge are made. The relationship between these data and previously measured projectile fragmentation data is discussed and a simple parametrization of projectile mass, target mass, and beam energy dependence of the differential cross sections is given.

• Research Organization: Nuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• OSTI ID: 5524336
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 25:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
ALKALI METAL COMPOUNDS
ANGULAR DISTRIBUTION
ARGON 40 REACTIONS
BOSONS
CARBON
CHARGED-PARTICLE REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COPPER
COULOMB FIELD
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRIC FIELDS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY DEPENDENCE
ENERGY RANGE
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
FRAGMENTATION
GEV RANGE
GEV RANGE 10-100
HADRONS
HALIDES
HALOGEN COMPOUNDS
HEAVY ION REACTIONS
INFORMATION
INTERACTIONS
MESONS
METALS
NEON 20 REACTIONS
NONMETALS
NUCLEAR REACTIONS
NUMERICAL DATA
PAIR PRODUCTION
PIONS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
PSEUDOSCALAR MESONS
SODIUM COMPOUNDS
SODIUM FLUORIDES
TRANSITION ELEMENTS
URANIUM