Database work for the new cross section standards evaluation

An effort is now underway to produce a new evaluation of the neutron standards. It is important to maintain experimental programs to increase the quality and extend the database for the neutron cross section standards in order to improve evaluations of them that will be used to convert cross section measurements made relative to those standards. Measurements have been made for most of the standard cross sections since the last evaluation of the standards. The improved database includes the cross sections for the H(n,n), Li-6(n,t), B-10(n,alpha gamma), 10B(n,a), C(n,n), Au(n,gamma), 235U(n,f) and U-238(n,f) standard reactions and ratios among them. The database also includes the U-238(n,gamma) and Pu-239(n,f) cross sectionsin addition to the standard cross sections. Those data were included since there are many ratio measurements of those cross sections with the standards and absolute data are available for them