1. NAME AND TITLE
AXMIX-PC: ANISN Cross Section Mixing Code System.
Technical University of Prague, Prague, Czechoslovakia.
3. CODING LANGUAGE AND COMPUTER
Fortran 77 and Assembler Language; IBM PC, IBM PC/XT, IBM PC/AT, PC 386.
4. NATURE OF PROBLEM SOLVED
AXMIX provides a fast, simple, and economical tool for creating cross-section data sets for
ANISN and DOT from cross-section sets already available on cards, nuclide-organized libraries, and
group-independent data sets. Numerous options including adjointing, Pn adjustments, changing table
length, mixing, transport corrections of ANISN-type cross sections, and management of cross-section
data sets and libraries are available.
5. METHOD OF SOLUTION
The number of energy groups which will fit into the core allocated is determined first. If all
groups will fit, the solution is straightforward; if not, then the maximum number of groups which will
fit is processed repeatedly using direct access I/O routines written in Assembler language.
6. RESTRICTIONS OR LIMITATIONS
AXMIX is limited in its ability to process cross-sections with upscatter and extra caution must be
used with them. This is due to the difference in the location of the total upscatter coefficient in ANISN
and DOT cross sections. A special section on upscatter is therefore included in the document.
7. TYPICAL RUNNING TIME
On an IBM PC/XT, 4.77 MHz, sample problem 1 took about 8 minutes; sample problem 2 took
only a few seconds. The IBM PC/XT had an 8087 math co-processor.
8. COMPUTER HARDWARE REQUIREMENTS
AXMIX-PC runs on the IBM PC, IBM PC/XT, IBM PC/AT and PC 386. At least 256 K bytes
of memory are required.
9. COMPUTER SOFTWARE REQUIREMENTS
Fortran 77 and Assembler compilers are required. The code was compiled with Microsoft Fortran
Version 5.0 and MASM Version 5.10 under the DOS 3.3 operating system.
Z. Novotny, "README," Informal Notes, Technical University of Prague, Prague, Czechoslovakia (November 13, 1990).
G. D. Haynes, "The AXMIX Program for Cross Section Mixing and Library Arrangement," ORNL/TM-5295 (December 2, 1974).
W. W. Engle, Jr., "AMP (Activity Manipulation Program)," Originally ORNL/TM-5296 (June 16, 1975).
W. A. Rhoades, "The GIP Program for Preparation of Group-Organized Cross Section Libraries,"
Informal Notes (November 1975).
11. CONTENTS OF CODE PACKAGE
Included are the referenced documents and one DS/DD 5.25-inch diskette (360 K) which contains
the source code plus sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: GAMMA-RAY CROSS SECTION PROCESSING; MICROCOMPUTER; MULTIGROUP CROSS SECTION PROCESSING; NEUTRON CROSS SECTION PROCESSING