Inclusive neutron production by 337 MeV/nucleon neon ions on carbon, aluminum, copper, and uranium
We measured inclusive double-differential cross sections at angles of 30, 45, 60, and 90 degrees for the production of neutrons above about 12 MeV from 337 MeV/nucleon neon ions bombarding targets of C, Al, Cu, and U. Three different energy regions can be distinguished in the neutron spectra: (1) a low-energy ''evaporation'' region. (2) a high-energy exponential tail reflecting the internal momentum distribution of the nucleons, and (3) an intermediate energy region reflecting quasifree and preequilibrium processes. The intermediate-energy region becomes less pronounced with increasing angle and is almost nonexistent at 90 degrees. This behavior is consistent with the interpretation that the intermediate-energy region consists mainly of scattering processes with a few direct collisions. The intermediate-energy region is relatively flat at the forward angles and merges into an exponential fall-off at wide angles. The 30-degree spectrum from the carbon target shows a broad peak around 150 MeV, which we interpret as a signature of quasi-free nucleon-nucleon collisions. Although the neutron detection threshold does not permit us to see the evaporation peaks, we do see evidence of the evaporation tails. The evaporation yields apparent in our spectra increase with the mass number of the target. The neutron spectra differ from proton spectra reported for similar targets at 385 MeV/nucleon and 393 MeV/nucleon. The neutron-to-proton cross section ratios are fit well by an intranuclear-cascade model calculation, but poorly by a ''firestreak'' model calculation.
- Research Organization:
- Department of Physics, Kent State University, Kent, Ohio 44242
- OSTI ID:
- 6005488
- Journal Information:
- Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 24:5; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
ALUMINIUM
ANGULAR DISTRIBUTION
BARYONS
CARBON
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
COPPER
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EVAPORATION MODEL
EXPERIMENTAL DATA
FERMIONS
GEV RANGE
GEV RANGE 01-10
HADRONS
HEAVY ION REACTIONS
INCLUSIVE INTERACTIONS
INFORMATION
INTERACTIONS
MATHEMATICAL MODELS
METALS
NEON 20 REACTIONS
NEUTRONS
NONMETALS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PROTON SPECTRA
QUASI-FREE REACTIONS
SCATTERING
SPECTRA
TRANSITION ELEMENTS
URANIUM