Accession Number : AD0709948

Title :   THE TEMPERATURE DEPENDENCE OF THERMAL NEUTRON DIFFUSION LENGTH IN GRAPHITE.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Touchstone,Frederick Faber , Jr

Report Date : JUN 1970

Pagination or Media Count : 56

Abstract : The existence of the two classes of thermal neutrons about the Bragg cut-off in a crystalline structure has been experimentally verified by the use of dysprosium-aluminum wire detector. The space dependent neutron flux in a 24x24x48 inch rectangular parallelopiped graphite pile, GLC grade HC and density 1.60 gm/cc, has been investigated. At each temperature a distinct 'knuckle' or change of neutron distribution is readily apparent, although this degree of change decreases with increasing temperature because the neutron cross section below the Bragg cut-off increases with increasing temperature. (Author)

Descriptors :   (*THERMAL NEUTRONS, GRAPHITE), TEMPERATURE, NEUTRON FLUX, NEUTRON CROSS SECTIONS, NEUTRON TRANSPORT THEORY, DYSPROSIUM COMPOUNDS, ALUMINUM COMPOUNDS, THESES

Subject Categories : Fission Reactor Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE