/sup 238/U resonance self-indication capture measurements and analysis. Interim report. [3 eV to 3 keV]

Technical Report · Tue Aug 01 04:00:00 EDT 1978

OSTI ID:6287706

Block, R C; Harris, D R; Kim, S H; Kobayashi, K

Neutron self-indication measurements simulating /sup 238/U capture in reactors were carried out over the energy range from 3 eV to 3 keV by use of shielding samples at 77K, 293K, and 873K. The data were reduced to capture yields which are provided on magnetic tape as benchmark data for comparison with nuclear design calculations. In the energy range below 10 eV improved multi-level parameters of the s-wave resonance at 6.67, 20.9, 36.8, 66.15, and 80.74 eV are obtained for these important levels. The new parameters lead to a lowering of the discrepancy between the calculated (with ENDF/B-IV data) and measured resonance integral in /sup 238/U thermal lattices. The program RPIFIT was developed for the analysis of the self-indication experiments, including a practical multilevel formalism which is accurate and which uses the well-known psi and /sub X/ functions to carry out Doppler braodening efficiently. Multilevel stochastic analysis is applied to calculation of neutron capture in the valleys between resonances, and it is shown that the cross section cannot be calculated accurately in the valleys without additional experimental information. 22 figures, 16 tables.

• Research Organization: Rensselaer Polytechnic Inst., Troy, NY (USA). Div. of Nuclear Engineering
• OSTI ID: 6287706
• Report Number(s): EPRI-NP-996
• Country of Publication: United States
• Language: English

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652025* -- Nuclear Properties & Reactions
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EPITHERMAL NEUTRONS
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
EV RANGE 100-1000
EVEN-ODD NUCLEI
FERMIONS
HADRON REACTIONS
HADRONS
HEAVY NUCLEI
HIGH TEMPERATURE
INTEGRALS
INTERMEDIATE NEUTRONS
ISOTOPES
KEV RANGE
KEV RANGE 01-10
KINETICS
LEVEL WIDTHS
LINE BROADENING
LOW TEMPERATURE
MEDIUM TEMPERATURE
MINUTES LIVING RADIOISOTOPES
MULTILEVEL ANALYSIS
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PARTIAL WAVES
RADIOISOTOPES
REACTOR KINETICS
REACTORS
RESONANCE
RESONANCE INTEGRALS
S WAVES
TARGETS
THERMAL REACTORS
URANIUM 238 TARGET
URANIUM 239
URANIUM ISOTOPES