1. NAME AND TITLE

PELINSCA: A Code System for Nuclear Elastic and Inelastic Scattering Calculations.

2. CONTRIBUTOR

Atomic Energy Board, Pretoria, Republic of South Africa, through the OECD NEA Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED.

The PELINSCA code calculates differential and total cross sections as well as polarization for nuclear elastic scattering of spin 0 or spin 1/2 particles. PELINSCA calculates cross sections (differential and total) and decay gamma-ray angular correlation for inelastic processes by means of standard Hauser-Feshbach (HF) theory) or with modified HF theory including width fluctuation corrections. In elastic scattering, optical model parameters may be optimized in a least squares procedure involving experimental measurements.

5. METHOD OF SOLUTION

The Schroedinger equation for complex potentials is solved according to the Fox-Goodwin method of numerical integration. Coulomb wave functions are calculated by using recurrence relations depending on the range of Coulomb and energy parameters. Least squares fits are made using parameter grid and direction of steepest descent. Statistical model calculations are made using closed mathematical expressions.

6. RESTRICTIONS OR LIMITATIONS

Elastic scattering calculations are limited to spin 0 or spin 1/2 particles. The number of partial waves is limited to 51. Statistical model calculations on targets with spin less than or equal to 5 and with partial waves up to l=6. Not suitable for heavy-ion Hauser-Feshbach calculations without first removing dimensional limitations. Program handles up to 3 reaction types simultaneously, e.g., (p,p), (p,n) and (p,alpha), each reaction channel having up to 33 final nuclear states.

7. TYPICAL RUNNING TIME

The typical running time is strongly dependent on the type of calculation performed (elastic scattering or Hauser-Feshbach), the number of incident particle energy points, and the number of reactions and final states in a statistical model calculation. Running time may vary between 30 seconds and as much as 20 to 30 minutes on the IBM 370/155. When executed at NEADB the sample problem compiled on the IBM 360/195 using the Fortran H compiler required 52 seconds; the GO step required 5 seconds. The operating system under which the program executed was the IBM 360 O.S. MVT.

8. COMPUTER HARDWARE REQUIREMENTS

On the IBM 360/195 the sample problem required 300 K in the compile step and 250 K in the GO step.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

C.A. Engelbrecht, H. Fiedeldey, J.W. Tepel, "PELINSCA, A Program for Nuclear Elastic and Inelastic Scattering Calculations," Atomic Energy Board, Pretoria, South Africa, Report PEL-202 (October 1974).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

January 1982.