1. NAME AND TITLE

MUP2: A Program to Calculate Fast Neutron Data for Medium-Heavy Nuclei

2. CONTRIBUTOR

Chinese Nuclear Data Center, Beijing, China, through NEA Data Bank, France.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; IBM 3090.

4. NATURE OF PROBLEM SOLVED

MUP2 calculates fast neutron data for medium-heavy nuclei.

5. METHOD OF SOLUTION

The program includes the optical model, width fluctuation corrected Hauser-Feshbach formula and pre-equilibrium statistical theory based on the exciton model. This code can calculate the cross sections of all reaction channels, the elastic and inelastic scattering angular distributions for the discrete states and secondary neutron spectra. The radial wave function in the optical model is solved by the Cowell method.

6. RESTRICTIONS OR LIMITATIONS

The calculations are restricted to medium-heavy nuclei, for which the fission reactions are absent. The maximum number of the isotopes of the target nucleus is limited to six. The energy region for incident neutrons is .01 to 20 MeV. The maximum number of energy points of outgoing secondary neutrons is 100.

7. TYPICAL RUNNING TIME

The sample input was tested at RSIC on the IBM 3090 under the MVS operating system. The problem took 11.98 seconds. Compilation of MUP2 was 19.74 seconds. Linking took .77 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

MUP2 runs on the IBM 3090.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written in Fortran 77 and requires the VS Fortran compiler (version 2.2.0 was used at RSIC).

10. REFERENCE

Su Zong Di and P. E. Hodgson, "Comparison Between Chinese Unified Program (MUP2) and International Nuclear Model Programs," IAEA0907/03 (May 4, 1988).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one DS/DD (360 K) 5.25-inch diskette.

12. DATE OF ABSTRACT

November 1990.