1. NAME AND TITLE

X4R: Code System for Retrieving EXFOR Cross Section Data According to a Given Target Nucleus.

2. CONTRIBUTOR

The Chinese Nuclear Data Center, Beijing, The People's Republic of China, through the OECD Nuclear Energy Agency Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; VAX 11/780.

4. NATURE OF PROBLEM SOLVED

X4R retrieves EXFOR data according to a given target nucleus, reaction type, year range and incident energy range. These are then converted to a data table form which can easily be processed by computer.

5. METHOD OF SOLUTION

X4R works on the basis of three dictionaries known as EXFOR reaction quantities, EXFOR data headings, and EXFOR data units. It is flexible and may easily be extended to more complicated EXFOR data formats.

6. RESTRICTIONS OR LIMITATIONS

It is necessary that the input data file be correctly coded in EXFOR format.

Before running X4R, it is necessary to determine whether all the necessary items are included in the dictionaries.

7. TYPICAL RUNNING TIME

X4R runs in 5 seconds on an IBM 3081. The test problem runs in 5.2 seconds on a VAX. The size of the EXFOR input file and the arrangement of the dictionaries controls the execution time.

8. COMPUTER HARDWARE REQUIREMENTS

X4R is operable on the VAX 11 computer. A peak working set of about 200 K bytes is required.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

L. X. Shen, "Program X4R - Version 85-1," Informal Notes (January 1985).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

January 1986.