Mass dependence of high-energy gamma-ray production in heavy-ion reactions

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.39.1371· OSTI ID:6312885

Tam, C L; Stevenson, J; Benenson, W; Clayton, J; Chen, Y; Kashy, E; Lampis, A R; Morrissey, D J; Samuel, M; Murakami, T K; others, and

Energy spectra and angular distributions were measured for high-energy gamma rays (E/sub ..gamma../>25 MeV) from the reactions /sup 7/Li+Li, /sup 7/Li+Pb, /sup 20/Ne+Mg, /sup 40/Ar+Ca, and /sup 40/Ar+Pb at incident beam energies of E/A = 30 MeV. The gamma-ray energy spectra for E/sub ..gamma../>25 MeV are roughly exponential and were observable to E/sub ..gamma..//similar to/100 MeV. The angular distributions of the gamma rays are slightly forward peaked in the laboratory frame and are consistent with emission from a single source traveling at the nucleon-nucleon center-of-mass velocity. The angular distribution in the nucleon-nucleon frame shows a substantial dipole component. The gamma-ray production cross section is roughly proportional to (A/sub proj/A/sub target/)/sup 2/3/ or to the calculated mean number of first neutron-proton collisions.

• Research Organization: National Superconducting Cyclotron Laboratory and Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824
• OSTI ID: 6312885
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METALS
ALKALINE EARTH METALS
ANGULAR DISTRIBUTION
ARGON 40 REACTIONS
BARYON-BARYON INTERACTIONS
BREMSSTRAHLUNG
CALCIUM
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
DATA
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
GAMMA RADIATION
HADRON-HADRON INTERACTIONS
HEAVY ION REACTIONS
INFORMATION
INTERACTIONS
IONIZING RADIATIONS
LEAD
LITHIUM
LITHIUM 7 REACTIONS
MAGNESIUM
METALS
MEV RANGE
MEV RANGE 100-1000
NEON 20 REACTIONS
NUCLEAR REACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
RADIATIONS
SPECTRA