RSIC COMPUTER CODE PSR-098
1. NAME AND TITLE
GALAXY-6: Neutron Multigroup Cross Section Processor.
OECD NEA Computer Programme Library, Ispra, Italy.
3. CODING LANGUAGE AND COMPUTER
Fortran IV and Assembler Language; IBM 370.
4. NATURE OF PROBLEM SOLVED
GALAXY-6 calculates spectrum-weighted group-averaged nuclear cross sections and group-to-group transfer cross sections from the evaluated microscopic cross section data contained in the
UKAEA Nuclear Data Library.
5. METHOD OF SOLUTION
Standard numerical integration methods are used by GALAXY-6. If the reciprocal of the total
cross-section of the mixture is needed for spectrum-weighting purposes, it is calculated at each of the
aggregate of energy points at which the cross-sections of the constituent material are given. Several
energy group dependent quantities are then computed which are the same for every reaction and
material. If the reciprocally averaged transport cross-section for the mixture is needed, it is computed
for each specified energy group from the total cross-section data, the elastic cross-section data, and the
elastic angular distribution data for the constituent materials of the mixture. GALAXY-6 then
computes group-averaged, spectrum-weighted cross sections for specified reactions and energy groups
with group-to-group transfer cross-sections for appropriate reactions for all or a specified subset of the
constituent materials of the mixture. The results of these computations, together with other data and
some of the input control information supplied by the user, are written on a tape. The entire process
is repeated for each remaining mixture specified in the control input data.
6. RESTRICTIONS OR LIMITATIONS
7. TYPICAL RUNNING TIME
No study has been made by RSIC of typical running times for GALAXY-6.
8. COMPUTER HARDWARE REQUIREMENTS
GALAXY-6 is operable on the IBM 370 computers. It uses a maximum of three discs and three
9. COMPUTER SOFTWARE REQUIREMENTS
Fortran IV and Assembler Language compilers are required.
J. A. Price, "A Guide to GALAXY 6 Part 1," AWRE 013/75 (November 1975).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: MULTIGROUP CROSS SECTION PROCESSING; NEUTRON CROSS SECTION PROCESSING