1. NAME AND TITLE OF DATA LIBRARY

HUGO VI: Photon Interaction Data in ENDF/B-VI Format. PHOTB6 in DLC-179/ENDLIB-97 is an updated version of these data.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS

EDPHOT: Computer Code for Editing Photon Interaction Data in ENDF Format.

COMP23: Computer Code for Editing and Comparing Two Photon Interaction Cross- Section Libraries in ENDF Format.

3. CONTRIBUTORS

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

National Institute of Standards and Technology, Gaithersburg, Md.

4. HISTORICAL BACKGROUND AND INFORMATION

The HUGO VI library is the most recent in a series that have been distributed from the Radiation Shielding Information Center while serving as the official set that is recommended for inclusion in a particular version of the Evaluated Nuclear Data File (ENDF/B). Earlier versions were distributed under the designation DLC-7/HPICE and DLC-99/HUGO. The evaluated sets are generally a collaborative effort lead by the National Institute of Standards and Technology (formerly NBS) and Lawrence Livermore National Laboratory. The role of RSIC is that of a reviewer and assembler of data from a variety of sources and forms into a library in proper format. This is followed by a review and correction phase that utilizes the expertise of the evaluators and potential users of the data. This current library is expected to be accepted as part of ENDF/B-VI.

Comparison with the ENDF/B-V version DLC-99/HUGO indicates no differences above 1 MeV for all elements. The changes are greatest at the lowest energies, as great as 10%, and generally decrease with increasing energy. The changed photoelectric cross sections are primarily due to the fact that a renormalization used in previous compilations is not used with the present compilation which results in better agreement with experiment. No changes were made in file 27 (coherent scattering form factors and incoherent scattering functions.)

5. APPLICATION OF THE DATA

The DLC-146/HUGO VI data can be used as a basic source of photon interaction data for radiation transport calculations. Many applications require the multigroup representation and in that case the HUGO will have to be processed by the standard multigroup processing code systems. The data is in ENDF/B-VI format, but systems that accept ENDF/B-V formats will accept HUGO.

6. SOURCE AND SCOPE OF DATA

The library is a translation to ENDF/B format from DLC-136/ PHOTX. Data are provided for elements with atomic number in the range Z=1 to 100. Both cross-section data (ENDF file 23) and coherent scattering form factors and incoherent scattering functions (ENDF file 27) are included. The energy range is 1 keV to 100 MeV. During the compilation exercise for DLC-99, an editing computer code EDPHOT was modified and updated to handle the present formats and was added to the HUGO packages. Another computer code, COMP23, which can be used to compare different versions of the data is also part of the packages.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAMS

Two computer codes, EDPHOT for selectively printing the data and COMP23 for comparing two photon interactions, are provided.

8. DATA FORMAT AND COMPUTER

Card images; IBM 3033.

9. TYPICAL RUNNING TIME

On the IBM 3033, the EDPHOT sample problem for EDPHOT ran in 6 s and the while that for COMP23 ran in 3 s.

10. REFERENCES

a. Included in the package:

D. K. Trubey, "HUGO VI Notes," (Aug. 1989).

R. W. Roussin, J. R. Knight, J. H. Hubbell, R. J. Howerton, Description of the DLC-99/HUGO Package of Photon Interaction Data in ENDF/B-V Format, ORNL/RSIC-46 (ENDF-335) (December 1983).

R. Kinsey, Ed., Data Formats and Procedures for the Evaluated Nuclear Data File, ENDF/B-V, BNL-NCS-50496 (ENDF-102), (October 1979). [Selected pages describing the format of photon interaction data].

b. Background information:

D. K. Trubey, M. J. Berger, and J. H. Hubbell, "Photon Cross Sections for ENDF/B-VI," American Nuclear Society topical meeting, Advances in Nuclear Engineering Computation and Radiation Shielding, Santa Fe, New Mexico (April 9-13, 1989).

11. CONTENTS OF PACKAGE

The package contains references listed above and the photon interaction data. Programs for editing and comparing the data and sample input and output are provided; total records 27,380.

12. DATE OF ABSTRACT

August 1989.