Inclusive neutron production by 337 MeV/A neon ions on carbon, aluminum, copper, and uranium
The inclusive double-differential cross sections for neutron production above about 12 MeV were measured at angles of 30, 45, 60 and 90 degrees. The neutrons were produced by 337 MeV/A 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 quasi-free and pre-equilibrium processes. The intermediate-energy region becomes less pronounced with increasing angle and is almost non-existent 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 is interpreted as a signature of quasi-free nucleon-nucleon collisions. Although the neutron detection threshold is not low enough to see the evaporation peaks, there is evidence of evaporation tails. The evaporation yields apparent in our spectra increase with the mass number of the target. The neutron spectra differ from the proton spectra reported for similar targets at 385 MeV/A and 393 MeV/A. 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:
- Kent State Univ., OH (USA)
- OSTI ID:
- 6207868
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
ALUMINIUM
BARYONS
CARBON
CHARGED-PARTICLE REACTIONS
COPPER
CROSS SECTIONS
DATA
DIRECT REACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
HADRONS
HEAVY ION REACTIONS
INFORMATION
METALS
MEV RANGE
MEV RANGE 10-100
NEON 20 REACTIONS
NEUTRON SPECTRA
NEUTRONS
NONMETALS
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
PARTICLE PRODUCTION
QUASI-FREE REACTIONS
SCATTERING
SPECTRA
TRANSITION ELEMENTS
URANIUM