Fundamental integral cross section ratio measurements in the thermal-neutron-induced uranium-235 fission neutron spectrum

Conference · Wed Oct 01 04:00:00 EDT 1975 · Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States)

OSTI ID:7194756

Fabry, A ^[1]; Grundl, J A; Eisenhauer, C

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1. CEN, Mol, Belg.

High-accuracy integral cross section ratio measurements have been performed in the thermal-neutron-induced uranium-235 fission neutron spectrum. This involves the basic fission reactions /sup 235/U(n,f), /sup 239/Pu(n,f), /sup 238/U(n,f) and /sup 237/Np(n,f); and the gold capture and /sup 115/In(n,n')/sup 115m/In dosimetry reactions. The uranium-235 fission neutron spectrum is generated at the center of a one meter diameter spherical cavity within a graphite thermal column. Simple and variable geometrical arrangements were used and evaluated for neutron field purity. The fission rates were determined with the NBS double fission chamber as well as with others of different size and design. All fission detectors were validated within a parallel program of interlaboratory comparisons in the MOL-..sigma sigma.. Standard Neutron Field. The activation rates have been measured with calibrated gamma-ray spectrometers. The resulting integral cross section ratios relative to the /sup 238/U(n,f) reaction are, for /sup 235/U(n,f): 3.94 +- 0.08; /sup 239/Pu(n,f): 5.93 +- 0.13; /sup 237/Np(n,f): 4.35 +- 0.13; /sup 115/In(n,n')/sup 115m/In; 0.620 +- 0.019 and; /sup 197/Au(n,..gamma..)/sup 198/Au: 0.287 +- 0.014. 5 tables, 2 figures. (auth)

• OSTI ID: 7194756
• Conference Information: Journal Name: Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States) Journal Volume: 1
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
FISSION
GAMMA RADIATION
GOLD 197 TARGET
GOLD 198
GOLD ISOTOPES
HADRON REACTIONS
HADRONS
HEAVY NUCLEI
INDIUM 115 TARGET
IONIZING RADIATIONS
ISOTOPES
NEPTUNIUM 237 TARGET
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
ODD-ODD NUCLEI
PLUTONIUM 239 TARGET
RADIATIONS
RADIOISOTOPES
SCATTERING
TARGETS
URANIUM 235 TARGET
URANIUM 238 TARGET