Measurement and analysis of an angular neutron flux on a beryllium slab irradiated with deuterium-tritium neutrons

Journal Article · Sun Nov 01 04:00:00 EST 1987 · Nucl. Sci. Eng.; (United States)

OSTI ID:6996108

Oyama, Y; Maekawa, H

Angular neutron fluxes leaking from the surface of beryllium slab assemblies have been measured with irradiation of deuterium-tritium neutrons. The experiment was performed using the time-of-flight technique with an NE-213 scintillation detector. The measured neutron energy range was from 50 keV to 15 MeV. The thicknesses of the slabs were 50.8 and 152.4 mm, and the measured angles of the angular fluxes were 0.0, 12.2, 24.9, 41.8, and 66.8 deg. The experimental results have been compared with the results calculated by the Monte Carlo codes, MORSE-DD and MCNP, using the data of beryllium in the JENDL-3PRI, ENDF/B-IV, and Los Alamos National Laboratory nuclear data files. The results calculated with these files showed discrepancies of 20 to 30% from the experimental results. It was pointed out that the angular distributions of an elastic cross section and the total cross section of an inelastic reaction for 14.8-MeV neutrons in the files were insufficient to reproduce the measured spectra.

• Research Organization: Japan Atomic Energy Research Institute, Dept. of Nuclear Engineering, Tokai-mura, Naka-gun, Ibaraki-ken, 319-11 (JP)
• OSTI ID: 6996108
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 97:3; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360106 -- Metals & Alloys-- Radiation Effects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
654003* -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ALKALINE EARTH METALS
ANGULAR DISTRIBUTION
BERYLLIUM
CALCULATION METHODS
COMPARATIVE EVALUATIONS
COMPUTER CODES
DATA
DATA ANALYSIS
DEUTERIUM TARGET
DISTRIBUTION
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FEDERAL REGION VI
INFORMATION
IRRADIATION
LOS ALAMOS
M CODES
MEASURING INSTRUMENTS
METALS
MONTE CARLO METHOD
NEUTRON FLUX
NEUTRON LEAKAGE
NEW MEXICO
NORTH AMERICA
NUMERICAL DATA
RADIATION DETECTORS
RADIATION FLUX
SCINTILLATION COUNTERS
SLABS
SOLID SCINTILLATION DETECTORS
TARGETS
TIME-OF-FLIGHT METHOD
TRITIUM TARGET
USA