Expected Precision for Neutron Multiplicity Assay Using Higher Order Moments

Year
1997
Author(s)
Mark M. Pickrell - Los Alamos National Laboratory
M.C. Miller - Los Alamos National Laboratory
D.G. Langner - Los Alamos National Laboratory
W. Harker - Los Alamos National Laboratory
M. S. Krick - Los Alamos National Laboratory
N. Esslin - Los Alamos National Laboratory
Abstract
This paper reports on the development of a new Figure of Merit code that can calculate the expected precision in neutron multiplicity assay using higher order moments. The code is used to provide a first look at the quadruple coincidence count rate and its expected precision. The results are good enough to warrant further study of potential applications of quadruple (quad) coincidences for large multiplying plutonium items. Also, the new code makes it possible to estimate the multiplicity assay precision if only randomly-triggered moments are used. This approach is described briefly, along with the current status of the investigation.