THE AGE OF FISSION NEUTRONS TO INDIUM RESONANCE ENERGY IN GRAPHITE. PART II. THEORY

Technical Report · Tue Oct 01 04:00:00 EDT 1963

OSTI ID:4155793

Alter, H

The first three moments of the distribution, about a point source of fission neutrons, of the slowing down density to indium resonance energy, were calculated for graphite using the Monte Carlo code, TYCHE, The effects of inelastic scattering, and of the anisotropy of elastic scattering, were included. These moments determine the moments of the flux distribution at the indium resonance energy, which are also available from experiments for comparison; such experiments are called age measurements, the age being one-sixth of the second moment. The age was calculated to be 307.4 plus or minus 1.0 cm/sup 2/ and the fourth and sixth moments were 6.590 x 10/sup 6/ cm/sup 4/ and 4.006 x 10/sup 10/ cm/sup 6/, respectively. These are in good agreement with experimentally measured values of 307.8 plus or minus 2.0 cm/sup 2/, 6.577 x 10/sup 6/ cm, and 3.843 x 10/sup 10/ cm/sup 6/. (auth)

• Research Organization: Atomics International. Div. of North American Aviation, Inc., Canoga Park, Calif.
• DOE Contract Number: AT(11-1)-GEN-8
• NSA Number: NSA-18-000981
• OSTI ID: 4155793
• Report Number(s): NAA-SR-Memo-8684
• Country of Publication: United States
• Language: English

Related Subjects

AGE ESTIMATION
ANISOTROPY
DISTRIBUTION
FISSION
GRAPHITE
INDIUM
MEASURED VALUES
MONTE CARLO METHOD
NEUTRON SOURCES
NEUTRONS
NUMERICALS
PHYSICS
PROGRAMMING
RESONANCE
SCATTERING
SLOWDOWN
STATISTICS