A Uranium-Metal Exponential Experiment
Journal Article
·
· Nuclear Science and Engineering
OSTI ID:4121823
- Los Alamos Scientific Laboratory (LASL), Los Alamos, NM (United States)
Certain conflicts arising from previous measurements of neutron flux parameters in the equilibrium spectrum of natural uranium were resolved. The parameters which were investigated are given along with "best" values as measured in this work: Material buckling, -0.0119 ± 0.0005 cm-2; Diffusion length, 9.17 ± 0.18 cm; U235/U238 fission cross-section ratio, 239 ± 7; Pu239/U238 fission cross-section ratio, 250 ± 16; Np237/U238 fission cross section ratio, 14.5 ± 0.5; and U238 inelastic scattering cross section, 2.00 ± 0.04 barns. The experiment was performed at the Pajarito critical assemblies facility utilizing two exponential columns of natural uranium, each 30.7-in. high, having diameters of 15 and 21 in. and excited by a small fast reactor. The system was outdoors, elevated some 11 ft above the ground level to reduce flux perturbations due to backscattering of neutrons. Perturbation corrected measurements in both columns made by several detection methods and with various source spectra agree to within experimental error and are consistent with calculated values.
- Research Organization:
- Los Alamos Scientific Laboratory (LASL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP); US Atomic Energy Commission (AEC)
- DOE Contract Number:
- W-7405-ENG-36
- NSA Number:
- NSA-15-006605
- OSTI ID:
- 4121823
- Journal Information:
- Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Vol. 8; ISSN 0029-5639
- Publisher:
- Taylor & Francis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
22 GENERAL STUDIES OF NUCLEAR REACTORS
BUCKLING
CROSS SECTIONS
DIFFUSION LENGTH
DISTURBANCES
ERRORS
EXPONENTIAL PILES
FAST NEUTRONS
FISSION
JEZEBEL
MEASURED VALUES
METALS
NEUTRON FLUX
Nuclear Criticality Safety Program (NCSP)
REACTORS
SCATTERING
SPECTRA
TOPSY
URANIUM
22 GENERAL STUDIES OF NUCLEAR REACTORS
BUCKLING
CROSS SECTIONS
DIFFUSION LENGTH
DISTURBANCES
ERRORS
EXPONENTIAL PILES
FAST NEUTRONS
FISSION
JEZEBEL
MEASURED VALUES
METALS
NEUTRON FLUX
Nuclear Criticality Safety Program (NCSP)
REACTORS
SCATTERING
SPECTRA
TOPSY
URANIUM