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Neutron Scattering in Hydrogenous Moderators, Studied by Time Dependent Reaction Rate Method

Abstract

The moderation and absorption of a neutron burst in water, poisoned with the non-1/v absorbers cadmium and gadolinium, has been followed on the time scale by multigroup calculations, using scattering kernels for the proton gas and the Nelkin model. The time dependent reaction rate curves for each absorber display clear differences for the two models, and the separation between the curves does not depend much on the absorber concentration. An experimental method for the measurement of infinite medium reaction rate curves in a limited geometry has been investigated. This method makes the measurement of the time dependent reaction rate generally useful for thermalization studies in a small geometry of a liquid hydrogenous moderator, provided that the experiment is coupled to programs for the calculation of scattering kernels and time dependent neutron spectra. Good agreement has been found between the reaction rate curve, measured with cadmium in water, and a calculated curve, where the Haywood kernel has been used.
Publication Date:
Mar 15, 1966
Product Type:
Technical Report
Report Number:
AE-223
Resource Relation:
Other Information: 21 refs., 6 figs., 2 tabs.
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; TIME DEPENDENCE; HYDRIDE MODERATORS; SCATTERING; NEUTRONS; CADMIUM; GADOLINIUM; NELKIN THEORY; HYDROGEN
OSTI ID:
20949514
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708489
Availability:
Commercial reproduction prohibited; OSTI as DE20949514
Submitting Site:
SWDN
Size:
30 pages
Announcement Date:
Dec 17, 2007

Citation Formats

Larsson, L G, Moeller, E, and Purohit, S N. Neutron Scattering in Hydrogenous Moderators, Studied by Time Dependent Reaction Rate Method. Sweden: N. p., 1966. Web.
Larsson, L G, Moeller, E, & Purohit, S N. Neutron Scattering in Hydrogenous Moderators, Studied by Time Dependent Reaction Rate Method. Sweden.
Larsson, L G, Moeller, E, and Purohit, S N. 1966. "Neutron Scattering in Hydrogenous Moderators, Studied by Time Dependent Reaction Rate Method." Sweden.
@misc{etde_20949514,
title = {Neutron Scattering in Hydrogenous Moderators, Studied by Time Dependent Reaction Rate Method}
author = {Larsson, L G, Moeller, E, and Purohit, S N}
abstractNote = {The moderation and absorption of a neutron burst in water, poisoned with the non-1/v absorbers cadmium and gadolinium, has been followed on the time scale by multigroup calculations, using scattering kernels for the proton gas and the Nelkin model. The time dependent reaction rate curves for each absorber display clear differences for the two models, and the separation between the curves does not depend much on the absorber concentration. An experimental method for the measurement of infinite medium reaction rate curves in a limited geometry has been investigated. This method makes the measurement of the time dependent reaction rate generally useful for thermalization studies in a small geometry of a liquid hydrogenous moderator, provided that the experiment is coupled to programs for the calculation of scattering kernels and time dependent neutron spectra. Good agreement has been found between the reaction rate curve, measured with cadmium in water, and a calculated curve, where the Haywood kernel has been used.}
place = {Sweden}
year = {1966}
month = {Mar}
}