Differential neutron production cross sections and neutron yields from stopping-length targets for 256-MeV protons

Technical Report · Tue Aug 01 04:00:00 EDT 1989

OSTI ID:5918859

Meier, M M; Amian, W B; Goulding, C A; Morgan, G L; Moss, C E

We have measured differential (p,xn) cross sections, d/sup 2//sigma//d/Omega/dE/sub n/, from thin targets and absolute neutron yields from stopping-length targets at angles of 7.5/degree/, 30/degree/, 60/degree/, and 150/degree/ for the 256-MeV proton bombardment of elemental beryllium, carbon, aluminum, and iron. Additional cross-section measurements are reported for oxygen, lead, and /sup 238/U. We used time-of-flight techniques to identify and discriminate against backgrounds and to determine the neutron energy spectrum. Comparison of the experimental data with intranuclear-cascade evaporation-model calculations using the code HETC showed discrepancies in the differential cross sections by as much as a factor of 7, notably at 7.5/degree/ and 150/degree/, and much better agreement for the stopping-length targets where transport presumably dominates production effects in the calculations. 15 refs., 16 figs., 4 tabs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5918859
• Report Number(s): LA-11656-MS; ON: DE89015976
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
BARYON REACTIONS
BERYLLIUM 9 TARGET
CARBON
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA ACQUISITION SYSTEMS
DIFFERENTIAL CROSS SECTIONS
ELEMENTS
HADRON REACTIONS
IRON
LEAD
MEASURING INSTRUMENTS
METALS
NEUTRON DETECTORS
NEUTRON SPECTRA
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
OXYGEN
PROTON REACTIONS
RADIATION DETECTORS
SPECTRA
STOPPING POWER
TARGETS
TIME-OF-FLIGHT METHOD
TRANSITION ELEMENTS
URANIUM 238 TARGET