DIFFERENTIAL NEUTRON THERMALIZATION. Annual Summary Report, October 1, 1961 through September 30, 1962

Technical Report · Wed Nov 28 04:00:00 EST 1962

DOI:https://doi.org/10.2172/4756387· OSTI ID:4756387

Whittemore, W L

Experimental and theoretical work on the interaction mechanisms by which neutrons exchange energy with H atoms involves treating neutron thermalization as neutron interactions with energy levels in the atoms. Cold moderators are presently being studied in order to optimize the source of cold neutrons. Cold neutrons are provided from an accelerator arrangement that directs electrons against a Fansteel target producing fast neutrons. Thermal neutrons, produced by moderation of fast neutrons, are passed through a chopper. Several moderators are evaluated, and neutron emission time measurements by crystal diffraction and beam chopper techniques point out emission time dependence on thickness, moderator, and temperature. The neutron beam chopper used presently is described, and results of neutron scattering by liquid para- and orthohydrogen are displayed and compared with theoretical predictions made with a perfect hydrogen gas model. Inelastic scattering of neutrons by liquid H is discussed, and theoretical and experimental results of inelastic scattering by polyethylene are also included. (D.C.W.)

• Research Organization: General Atomic Div., General Dynamics Corp., San Diego, Calif.
• DOE Contract Number: AT(04-3)-167
• NSA Number: NSA-17-015213
• OSTI ID: 4756387
• Report Number(s): GA-3409
• Country of Publication: United States
• Language: English

Related Subjects

ACCELERATORS
ATOMS
BEAMS
CRYSTALS
DIFFRACTION
ELECTRONS
EMISSION
ENERGY
ENERGY LEVELS
FAST NEUTRONS
GAS MODEL
HYDROGEN
INTERACTIONS
LIQUIDS
MEASURED VALUES
MODERATORS
NEUTRON SOURCES
NEUTRON SPECTROMETERS
NUCLEAR MODELS
PHYSICS
POLYETHYLENES
SCATTERING
SLOWDOWN
TARGETS
TEMPERATURE
THERMAL NEUTRONS
THICKNESS