ACTIVE NEUTRON MULTIPLICITY ANALYSIS AND MONTE CARLO CALCULATIONS*

Year
1994
Author(s)
Robert N. Ceo - Martin Marietta Energy Systems Inc.
L. Lloyd Collins - Martin Marietta Energy Systems Inc.
D.G. Langner - Los Alamos National Laboratory
J.E. Stewart - Los Alarnos National Laboratory
R. Siebelist - Los Alamos National Laboratory
N. Ensslin - Los Alamos National Laboratory
M. S. Krick - Los Alamos National Laboratory
P.K. May - Martin Marietta Energy Systems
Abstract
Active neutron multiplicity measurements of highenrichment uranium metal and oxide samples have been made at Los Alamos and Y-12. The data from the measurements of standards at Los Alamos were analyzed to obtain values for neutron multiplication and source-sample coupling. These results are compared to equivalent results obtained from Monte Carlo calculations. An approximate relationship between coupling and multiplication is derived and used to correct doubles rates for multiplication and coupling. The utility of singles counting for uranium samples is also examined.