Neutron and gamma-ray spectra from /sup 232/Th, /sup 235/U, /sup 238/U, and /sup 239/Pu after bombardment with 14-MeV neutrons. [Stilbene, NE-213]

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · Nucl. Sci. Eng.; (United States)

OSTI ID:5702760

Hansen, L F; Wong, C; Komoto, T T; Pohl, B A; Goldberg, E; Howerton, R J; Webster, W M

The neutron and gamma-ray leakage spectra from pulsed spheres having a radius equal to 1.0 mean-free path (mfp) for 14-MeV neutrons in /sup 232/Th, /sup 235/U (with radii of 0.7 and 1.5 mfp), /sup 238/U (with radii of 0.8 and 2.8 mfp), and /sup 239/Pu (with radii of 0.7 and 1.25 mfp) were measured by using time-of-flight techniques. The neutron spectra were measured between 0.9 and 15 MeV with stilbene and NE-213 scintillators. For the gamma rays, the electron recoil spectra were measured between 0.35 and 8 MeV with the NE-213 detector only. Pulse-shape discrimination and flight paths of approx. 10 m were used in these measurements. The measured spectra are compared with calculations carried out with TARTNP, a coupled neutron-photon Monte Carlo transport code. The Lawrence Livermore Laboratory ENDL (neutron and photon cross sections) and ENDF/B-IV libraries were used in these calculations. In the region between 10 and 15 MeV, the calculated neutron spectra are in good agreement with the measurements (+-5%). The maximum discrepancy observed for the neutrons between 0.9 and 10 MeV is 30%. The notable exception is /sup 232/Th, where calculations carried out with the ENDF/B-IV underestimate by a factor of 2 the neutron emission between 5 and 10 MeV. The gamma-ray emission calculations were carried out only with ENDL, because of its overall better representation of the neutron measurements; ENDL overestimates the gamma-ray production, with discrepancies ranging between 5 and 20%. However, use of the measured detector efficiency would reduce the maximum discrepancy to < 13%. To facilitate the use of the neutron data for calculational purposes by other laboratories, an experimental one-dimensional neutron energy spectrum is given for each measurement. 10 figures, 7 tables.

• Research Organization: Univ. of California, Livermore
• OSTI ID: 5702760
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 72:1; ISSN NSENA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIDES
ALPHA DECAY RADIOISOTOPES
AROMATICS
BARYON REACTIONS
BARYONS
DATA
DATA FORMS
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELECTRON SPECTRA
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FAST NEUTRONS
FERMIONS
GAMMA RADIATION
GAMMA SPECTRA
GRAPHS
HADRON REACTIONS
HADRONS
HEAVY NUCLEI
HYBRID REACTORS
HYDROCARBONS
INFORMATION
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIQUID SCINTILLATION DETECTORS
MEASURING INSTRUMENTS
METALS
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NEUTRAL-PARTICLE TRANSPORT
NEUTRON LEAKAGE
NEUTRON REACTIONS
NEUTRON SPECTRA
NEUTRON TRANSPORT
NEUTRONS
NUCLEAR DATA COLLECTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLUTONIUM
PLUTONIUM 239
PLUTONIUM 239 TARGET
PLUTONIUM ISOTOPES
RADIATION DETECTORS
RADIATION TRANSPORT
RADIATIONS
RADIOISOTOPES
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
SPECTRA
SPHERES
STILBENE
TABLES
TARGETS
THORIUM
THORIUM 232
THORIUM 232 TARGET
THORIUM ISOTOPES
TRANSURANIUM ELEMENTS
URANIUM
URANIUM 235
URANIUM 235 TARGET
URANIUM 238
URANIUM 238 TARGET
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES