1. NAME AND TITLE OF DATA LIBRARY

MATXS11: 80-Group Neutron, 24-Group Photon Cross Sections from ENDF/B-VI in MATXS Format.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS

BBC: Utility Code for Maintaining MATXS Libraries.

3. CONTRIBUTOR

Los Alamos National Laboratory, New Mexico.

4. HISTORICAL BACKGROUND AND INFORMATION

NJOY91.91 was used to process this library derived from ENDF/B-VI. MATXS11 is an update of the ENDF/B-V derived DLC-116/MATXS6A library, which was added to the RSIC collection in December 1985.

5. APPLICATION OF THE DATA

MATXS11 is useful for most high-energy calculations, including coupled neutron-photon-heating calculations in fusion blanket systems and the analysis of fast reactor cores.

6. SOURCE AND SCOPE OF DATA

The MATXS11 library uses 80 neutron groups and 24 photon groups and includes 105 materials from ENDF/B-VI (including changes through Release 2). The materials are given at up to 9 temperatures ranging from 300 to 4000 K with typically 5 to 8 background cross sections for each temperature. The weight function had a fast reactor or fusion blanket shape with a fusion peak at high energies and a 1/E + thermal Maxwellian extension at low energies. The Legendre order for the scattering matrices is P5. Photon production, photon interaction, KERMA, damage, and all ENDF partial cross sections are included. Thermal upscatter is not included.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

The Fortran 77 program BBC is included in this package to convert the library to binary format for subsequent processing with the PSR-317/TRANSX2 code system to interface the MATXS cross-section libraries with nuclear transport codes for radiation transport calculations. Other functions of BBC include indexing MATXS libraries, and maintaining them by inserting, deleting, and extracting individual materials. Information on BBC, which was extracted from the TRANSX2 document, is given in APPENDIX A. This version of BBC is configured to run on Sun workstations.

8. DATA FORMAT AND COMPUTER

ASCII card images; all computers (D00177/ALLCP/00).

9. TYPICAL RUNNING TIME

BBC converted MATXS11 to binary in less than 2 minutes on a SunSparcstation 2.

10. REFERENCES

R. E. MacFarlane, LANL Informal Notes.

Note (February 1994).

BBC Output Edit for First 5 Records (INDEX 11) (February 1994).

Using BBC (extracted from LA-12312-MS) (July 1992).

MATXS File Description (extracted from LA-12312-MS) (July 1992).

R. E. MacFarlane, "Processing and Testing ENDF/B-VI with NJOY and TRANSX," LA-UR-94-1284 (1994).

11. CONTENTS OF LIBRARY

Included are the referenced document and a UNIX compressed tar file on cartridge tape which contains the data and index files, BBC source and input and a README file with information on compiling and running BBC.

12. DATE OF ABSTRACT

February 1994, April 1994.

KEYWORDS: MULTIGROUP CROSS SECTIONS BASED ON ENDF/B; NEUTRON CROSS SECTIONS; GAMMA-RAY CROSS SECTIONS; COUPLED NEUTRON-GAMMA-RAY CROSS SECTIONS; KERMA FACTORS; MATXS FORMAT