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

Abstract

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.)

Authors:
Publication Date:
Research Org.:
General Atomic Div., General Dynamics Corp., San Diego, Calif.
OSTI Identifier:
4756387
Report Number(s):
GA-3409
NSA Number:
NSA-17-015213
DOE Contract Number:  
AT(04-3)-167
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-63
Country of Publication:
United States
Language:
English
Subject:
PHYSICS; 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; POLYETHYLENES; SCATTERING; SLOWDOWN; TARGETS; TEMPERATURE; THERMAL NEUTRONS; THICKNESS

Citation Formats

Whittemore, W L. DIFFERENTIAL NEUTRON THERMALIZATION. Annual Summary Report, October 1, 1961 through September 30, 1962. United States: N. p., 1962. Web. doi:10.2172/4756387.
Whittemore, W L. DIFFERENTIAL NEUTRON THERMALIZATION. Annual Summary Report, October 1, 1961 through September 30, 1962. United States. doi:10.2172/4756387.
Whittemore, W L. Wed . "DIFFERENTIAL NEUTRON THERMALIZATION. Annual Summary Report, October 1, 1961 through September 30, 1962". United States. doi:10.2172/4756387. https://www.osti.gov/servlets/purl/4756387.
@article{osti_4756387,
title = {DIFFERENTIAL NEUTRON THERMALIZATION. Annual Summary Report, October 1, 1961 through September 30, 1962},
author = {Whittemore, W L},
abstractNote = {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.)},
doi = {10.2172/4756387},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1962},
month = {11}
}