218-group neutron cross-section library in the AMPX master interface format for criticality safety studies Page: 31 of 50
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APPENDIX A
AMPX Kaster Library Interface*
The AIPX multigroup master cross-section library formats have been
designed with a generality paralleling that of the ENDF/ point data li-
braries. For example:
1. Resonance parameters can be passed.
2. Any number of reactic.. cross sections is allowed. ENDF/3
identifications are retained where possible.
3. Any scattering p" _ess can be represented anisotropically to any
order.
4. Any process can have a transfer matrix. For example, XIACS
produces a transfer matrix for each inelastic level.
5. Temperature dependence is allowed on thermal scattering kernel.
Special arrays designated "magic-yord" arrays are used to compact the
potentially very lengthy transfer arrays on the interfaces. These formats
effectively eliminate zero and impossible elements from the transfer arrays.
Four types of arrays are used in the formats:
1. The aforementioned "magic-word" array,
2. Temperature dependent 1-D arrays,
3. Temperature independent 1-D arrays, and
4. The resonance parameter array.
A.1 Magic-Word Array
The structure of a magic-word array is as follows:
1. Length of magic-word string which follows,
2. Magic word for first non-zero group (note that this is not
necessarily the first energy group),
*This material was taken from Section 11 of Ref. 1.22
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Ford, W. E., III; Webster, C. C. & Westfall, R. M. 218-group neutron cross-section library in the AMPX master interface format for criticality safety studies, report, July 1, 1976; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1448516/m1/31/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.