THE FISSION CROSS-SECTIONS OF $sup 232$Th, $sup 235$U, $sup 237$Np, AND $sup 238$U FOR NEUTRONS OF ENERGIES RANGING FROM 10 to 22 MeV

Journal Article · Tue Nov 01 04:00:00 EST 1960 · Atomnaya Energ.

OSTI ID:4074797

Pankratov, V M; Vlasov, N A; Rybakov, B V

The time-of-flight analysis and D(d,n)He/sup 3/ neutron source were utilized in determination of the neutron fission cross sections of Th/sup 232/, U/ sup 235/, Np/sup 237/, and U/sup 2 / 3>s/sup 8/ at 10 to 22 Mev. The time-of- flight method was used for separating the monoenergy neutron effects in the reaction. The deuteron energy was varied from 6.5 to 19.5 Mev (neutron energy 9.7 to 21.7 Mev, respectively) by means of interchangeable foils placed in front of the target. The energy straggling determined by the thickness of the deuterium gas target was 250 kev at E/sub d/ = 19.5 Mev and 700 kev at E/sub d/ = 6.5 Mev. All measuremerts were taken at O deg angle to the deuteron beam. The statistical error of measurements does not exceed 3%. The distribution of U/sup 235/ fission cross sections is sharply nonmonotonic due to the (n,3n) reaction threshold of about 1.5 Mev which exceeds the tertiary fission. The fission cross section of U/sup 235/ at 10 to 22 Mev is smaller than anticipated. (R.V.J.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-012088
• OSTI ID: 4074797
• Journal Information: Atomnaya Energ., Journal Name: Atomnaya Energ. Vol. Vol: 9
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ANGULAR DISTRIBUTION
CROSS SECTIONS
DEUTERIUM
DEUTERON BEAMS
DEUTERONS
DISTRIBUTION
ENERGY
ENERGY LEVELS
ENERGY RANGE
ERRORS
FAST NEUTRONS
FISSION
FOILS
GASES
HELIUM 3
NEPTUNIUM 237
NEUTRON SOURCES
NEUTRON SPECTROMETERS
NEUTRONS
NUCLEAR REACTIONS
PHYSICS
SLOWDOWN
STATISTICS
TARGETS
THICKNESS
THORIUM 232
URANIUM 235
URANIUM 238
VELOCITY