NEUTRON THERMALIZATION AND DIFFUSION IN HEAVY MEDIA

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

OSTI ID:4285350

Kazarnovskii, M V ^[1]; Stepanov, A V; Shapiro, F L

---

1. Kazarnovsky

Problems of neutron thermalization and diffusion theory for heavy media are discussed. An age equation type expression for space-energy distribution of slow and thermal neutrons in a heavy nonuniform monatomic gas moderator with a weak absorption is derived and an expression for space-energy distribution near the boundary of two media is obtained. The slow neutron spectrum in a heavy crystalline medium is calculated for the energy region where the thermal motion and chemical bonds of the moderator atoms are important. A multigroup method of analyzing neutron diffusion in a heavy medium is developed which takes into account changes in neutron energy distribution. The influence of thermal motion and of the crystalline bonds on time-energy distribution of slow neutrons in heavy moderators is investigated. It is shown that the distribution width increases with the medium effective temperature. (auth)

• Research Organization: U.S.S.R.
• NSA Number: NSA-13-006932
• OSTI ID: 4285350
• Report Number(s): A/CONF.15/P/2148
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ATOMS
CRYSTALS
DIFFUSION
DISTRIBUTION
ENERGY
EQUATIONS
FERMI AGE
GASES
GROUP THEORY
MODERATORS
MOLECULES
NEUTRONS
PHYSICS AND MATHEMATICS
SLOWDOWN
SPECTRA
SURFACES
TEMPERATURE
THERMAL NEUTRONS