MEASUREMENTS OF RADIATIVE CAPTURE CROSS SECTIONS FOR FAST NEUTRONS

Technical Report · Sat Oct 31 04:00:00 EST 1959

OSTI ID:4284591

Leipunskii, A I ^[1]; Kazachkovskii, O D ^[2]; Artyukov, G Y

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1. Leipunsky
2. Kazachkovsky

Cross-section measurements of radiative capture were made both for monoenergetic fast neutrons and for a wide spectra of fast neutrons by means of an activation method, as well as by neutron halance in the spherical geometry of the experiment, by capture gamma rays, and by reactivity measurements. Measurements of capture cross sections for a number of elements, including natural isotopic mixtures, were carried out by the method of neutron balance in spherical geometry, using photoneutron sources. In onder to measure capture cross sections of natural isotopic mixtures and isotopes which cannot be activated, a method was developed involving capture gamma ray measurements. Gamma radiation was registered by scintillation counters with naphthalene and fluorite crystals. By a methed of activation (by induced BETA activity) capture cross sections were measured by using neutron reactions T(p,n)He/sup 3/ and D-D as sources. Measurements were made by means of comparison with capture cross sections of thermal neutrons. A similar methed was used for Sb-Be photoneutron capture cross section measurement. Radiative capture cross sections of a large group of isotopes were measured by the method of reactivity (natural isotopic mixtures) and by the activation method (activated isotopes). In the core of the fast reactor BR-1 the effective absorption of neutrons by various elements was measured by the global oscillator method. The neutron capture cross sections for the fission spectrum were measured for a large group of isotopes by the activation method, as well as for the neutron spectra in the core center and in the reflector of a fast reactor. The results which were obtained in the experiments described are discussed in accordance with the shell model and statistical theory. (auth)

• Research Organization: U.S.S.R.
• NSA Number: NSA-13-007014
• OSTI ID: 4284591
• Report Number(s): A/CONF.15/P/2219
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ACTIVATION
ANTIMONY
BERYLLIUM
BETA DECAY
BR-1
CAPTURE
CROSS SECTIONS
CRYSTALS
DEUTERIUM
DEUTERON BEAMS
ELEMENTS
FAST NEUTRONS
FISSION
FLUORINE COMPOUNDS
GAMMA RADIATION
ISOTOPES
MEASURED VALUES
NAPHTHALENE
NEUTRON SOURCES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR THEORY
OSCILLATIONS
PHOTONEUTRONS
PHYSICS AND MATHEMATICS
PROTON BEAMS
REACTIVITY
REACTORS
REFLECTORS
SCINTILLATION COUNTERS
SHELL MODELS
SPECTRA
STATISTICS
THERMAL NEUTRONS