IAEA0829 PELINSCA.

1. NAME OR DESIGNATION OF PROGRAM:  PELINSCA.

3. NATURE OF PHYSICAL PROBLEM SOLVED

Calculates differential and total cross sections as well as polarization for nuclear elastic scattering of spin 0 or spin 1/2 particles. 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.

4. METHOD OF SOLUTION

Schroedinger equation for complex potentials is  solved according to Fox-Goodwin method of numerical integration.
Coulomb wave functions are calculated by using recurrence relations  depending on 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.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Elastic scattering calculations limited to spin 0 or spin 1/2 particles. Number of partial waves limited to 51. Statistical model calculations on targets with spin less 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.

6. TYPICAL RUNNING TIME

2 minutes on IBM 370/155. Strongly dependent on 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 sec and as much as 20  to 30 minutes on above computer.

7. UNUSUAL FEATURES OF THE PROGRAM

Program permits general and automatic statistical model calculations involving many final nuclear states and up  to three different types of reactions.

8. RELATED AND AUXILIARY PROGRAMS

Uses IBM 370/155 based computer routines DATE and TIME, which may be replaced by local equivalents or removed from program.

10. REFERENCES

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

11. MACHINE REQUIREMENTS

208 kbytes of main storage. Disk for temporary storage of results in certain cases.

13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 360 O.S. MVT.

14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Since there is constant cross referencing between different programs any changes to the common must be made with extreme care.

15. NAME AND ESTABLISHMENT OF AUTHOR

    C.A. Engelbrecht, H. Fiedeldey and J.W. Tepel
    Atomic Energy Board
    Private Bag 256
    Pretoria 0001
    South Africa.

File name	File description	Records
IAEA0829_01.002	SOURCE PROGRAM (F4,EBCDIC)	2889
IAEA0829_01.003	JCL	31
IAEA0829_01.004	SAMPLE PROBLEM INPUT DATA	23
IAEA0829_01.005	SAMPLE PROBLEM PRINTED OUTPUT	420