1. NAME AND TITLE OF DATA LIBRARY

FEWG1-85: Defense Nuclear Agency 37 Neutron, 21 Gamma Ray Coupled, P₃, Multigroup Library in ANISN Format.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAM

BCBN: Code to Convert Library from Card Image to Binary Form.

3. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

4. HISTORICAL BACKGROUND AND INFORMATION

A state-of-the-art cross-section library has been developed for the Defense Nuclear Agency in a 37-21 neutron-gamma energy group structure which can be used for radiation transport calculations on most available computer facilities.

5. APPLICATION OF THE DATA

Based on data from the DNA Working Cross Section Library and the Evaluated Nuclear Data File, the library contains cross sections for 41 nuclides that can be used to solve typical calculations of interest to the DNA radiation transport community.

6. SOURCE AND SCOPE OF DATA

To aid their contractors, DNA requested that Oak Ridge National Laboratory develop and test a coupled cross-section library having the minimum number of neutron and gamma-ray energy groups to obtain acceptable accuracy in the transport results. The resulting library, processed with the AMPX code, contains 37 neutron groups and 21 gamma-ray groups and includes cross sections for 41 nuclides of specific interest to the defense community. The library is based on cross-section data from the DNA Working Cross Section Library and the Evaluated Nuclear Data File.

FEWG1-85 contains 41 nuclides. The cross sections were processed into a coupled 3-21 neutron-gamma energy group structure with gamma-ray production included for each element. The neutron groups are tailored to allow for the major peaks and valleys in the total neutron cross sections of nitrogen, oxygen, silicon, and iron, and the gamma-ray groups are tailored to allow accurate calculation of pair production, annihilation photon transport, hydrogen capture, and backscatter photon transport.

A set of response functions useful in radiation transport applications is also included as part of the library.

The cross-section data were processed with the AMPX code system.

The materials included in the library are:

H, ³H, ⁶Li, ⁷Li, ⁹Be, ¹⁰B, ¹¹B, ¹²C, N, O, F, Na, Mg, Al, Si, Cl, K, Ca, V, Cr, Mn, Fe, Ni, Cu, Mo, ¹⁸¹Ta, ¹⁸²W, ¹⁸³W, ¹⁸⁴W, ¹⁸⁶W, Pb, ²³⁵U, ²³⁸U, ²³⁹Pu, ²⁴⁰Pu, Ar, Ti, Gd, ³¹P, ³²S, Ba.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAM

BCBN does a simple conversion from card image to binary form. No input required.

8. DATA FORMAT AND COMPUTER

Card image, ANISN format; IBM 370/3033. (D00031/I0360/01, /02, /03, /04, /05, /06)

9. TYPICAL RUNNING TIME

Conversion from card image to binary form required 20 sec. on the IBM 3033.

10. REFERENCE

D. E. Bartine, J. R. Knight, J. V. Pace, III, and R. W. Roussin, "Production and Testing of the DNA Few-Group Coupled Neutron-Gamma Cross-Section Library," ORNL/TM-4840 (March 1977).

11. CONTENTS OF LIBRARY

Included are the referenced document and one (1.44 MB) diskette in DOS format which contains the cross section library materials, the retrieval program plus output from the sample problem.

12. DATE OF ABSTRACT

July 1974; update October 1977, January 1985.