Coulomb effects on pions produced in heavy-ion reactions

Technical Report · Sun Nov 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/5670160· OSTI ID:5670160

Sullivan, J. P.

Double differential cross sections for the production of ..pi../sup +/ and ..pi../sup -/ near the velocity of the incident beam for pion lab angles less than 40 degrees are presented. The experimental apparatus and the techniques are discussed. Beams of /sup 20/Ne with E/A from 80 to 655 MeV and /sup 40/Ar with E/A = 535 MeV incident on Be, C, NaF, KC1, Cu, and U targets were used. A sharp peak in the ..pi../sup -/ spectrum and a depression in the ..pi../sup +/ spectrum were observed at zero degrees near the incident beam velocity. The effect is explained in terms of Coulomb interactions between the pions and fragments of the incident beam. Least squares fits to the data using the Coulomb correction formulas of Gyulassy and Kauffman and an effective projectile fragment charge are made. The relationship between these data and previously measured pion production and projectile fragmentation data is discussed. The data are also compared to some theoretical models. A simple expression is given for the differential cross section as a function of the projectile mass, target mass, and beam energy.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5670160
• Report Number(s): LBL-12546; ON: DE82007198
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
ALKALI METALS
ARGON 40 REACTIONS
BASIC INTERACTIONS
BERYLLIUM 9 TARGET
BOSONS
CARBON
CHARGED-PARTICLE REACTIONS
CHLORINE
COPPER
COULOMB SCATTERING
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FLUORINE 19 TARGET
FRAGMENTATION
HADRONS
HALOGENS
HEAVY ION REACTIONS
INFORMATION
INTERACTIONS
MESONS
METALS
MEV RANGE
MEV RANGE 100-1000
NEON 20 REACTIONS
NONMETALS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE PRODUCTION
PIONS
PIONS MINUS
PIONS PLUS
POTASSIUM
PSEUDOSCALAR MESONS
SCATTERING
SODIUM 23 TARGET
TARGETS
TRANSITION ELEMENTS
URANIUM