Neutron spectrum from a uramium-235 sphere bombarded by 14-MeV neutrons
A benchmark measurement of the neutron leakage spectrum from a pulsed 38-kg uranium (93.5 percent /sup 235/U) sphere has been made using time-of-flight techniques. The sphere had a multiplication of approximately 11 for 14-MeV neutrons, and a neutron hold-up time of approximately 40 nsec. The centrally located source of 14.1 +- 0.8-MeV neutrons, produced by bombarding a tritium gas target with pulses of low-energy deuterons, was isotropic to +-7.7 percent. Neutrons in the 0.180- to 16.0-MeV energy range were detected at the end of a 39-m flight path by an Ne-213 liquid scintillator employing pulse-shape discrimination. The detector efficiency was measured over this same energy range using monoenergetic neutrons from the T(p,n) T(d,n), and D(d,n) reactions. The measured neutron flux as a function of energy is compared with the results of Monte Carlo calculations performed with the MCN code. Uranium cross sections from ENDF/B-IV and an older set from Lawrence Livermore Laboratory were used in the calculations. The results calculated using the ENDF/B-IV cross sections are in good agreement with the measurements, especially in the 1- to 6-MeV energy region where the uncertainties in both the calculated and experimental results are the smallest.
- Research Organization:
- Los Alamos Scientific Lab., NM
- OSTI ID:
- 7140327
- Journal Information:
- Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 61:1; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
220600* -- Nuclear Reactor Technology-- Research
Test & Experimental Reactors
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIDES
ALPHA DECAY RADIOISOTOPES
COMPARATIVE EVALUATIONS
CONFIGURATION
DATA
ELEMENTS
ENRICHED URANIUM
EVEN-ODD NUCLEI
EXPERIMENTAL REACTORS
HEAVY NUCLEI
HIGHLY ENRICHED URANIUM
INFORMATION
ISOMERIC TRANSITION ISOTOPES
ISOTOPE ENRICHED MATERIALS
ISOTOPES
METALS
MINUTES LIVING RADIOISOTOPES
NEUTRON FLUX
NEUTRON LEAKAGE
NEUTRON SPECTRA
NUCLEI
PULSED NEUTRON TECHNIQUES
RADIATION FLUX
RADIOISOTOPES
REACTORS
RESEARCH AND TEST REACTORS
SPECTRA
SPHERICAL CONFIGURATION
SUBCRITICAL ASSEMBLIES
URANIUM
URANIUM 235
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES