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NEA-0204 SASSI.

SASSI, Total and Differential Elastic and Inelastic Neutron Cross-Sections by Hauser-Feshbach

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1. NAME OR DESIGNATION OF PROGRAM:  SASSI.
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2. COMPUTERS
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Program name Package id Status Status date
SASSI NEA-0204/02 Tested 12-APR-2001

Machines used:

Package ID Orig. computer Test computer
NEA-0204/02 IBM 7094 PC Pentium II 450
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3. NATURE OF PHYSICAL PROBLEM SOLVED

Neutron total and differential elastic and inelastic cross-section evaluation by means of the statistical model of Hauser-Feshbach (1) as modified by D. Goldman (2) (3). The Goldman modification includes the effect of spin-orbit  coupling on transmission coefficients.
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4. METHOD OF SOLUTION:  For numerical integration the Fox-Goodwins method is used.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

   Angular momentum I less than or equal to 50.
   Number of excited levels less than or equal to 30.
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6. TYPICAL RUNNING TIME:  2 min. for I max = 6 and six levels.
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7. UNUSUAL FEATURES OF THE PROGRAM

Penetrabilities are directly evaluated solving the Schroedinger equation for spherical optical potential with spin orbit coupling.
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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
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9. STATUS
Package ID Status date Status
NEA-0204/02 12-APR-2001 Tested at NEADB
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10. REFERENCES

- W. Hauser and H. Feshbach:
  Phys. Rev. 87, 366 (1952).
- E.H. Auerbach et al.:
  KAPL - 3020.
- M.A. Friedman et al.:
  APDA - 141.
NEA-0204/02, included references:
- V. Benzi, F. Fabbri and L. Zuffi:
  SASSI - A FORTRAN Programme for the Calculation of Nucleon
  Scattering from a Spherical Optical Potential
  Doc.CEC(68)18 (December 1968)
- Program Note - SASSI (4 pages)
- V. Benzi, F. Fabbri and A.M. Saruis:
  SMOG: Un programma per il calcolo dei parametri di interazione
  neutrone-nucleo con il modello ottico (in Italian)
  CEC/63-61-SU-04, RAPTUS 15-SU-03 (February 1963)
- How to Use - SASSI
- A. Prince, G. Reffo and E. Sartori:
  Report on the International Nuclear Model Code Intercomparison,
  Spherical Optical and Statistical Model Study
  NEANDC-152"A",INDC(NEA)4 (3 October 1983)
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0204/02 FORTRAN-95
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13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHOR

       V. Benzi, F. Fabbri, L. Zuffi
       Centro di Calcolo del CNEN
       Via Mazzini 2
       40100 - Bologna
       Italy
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16. MATERIAL AVAILABLE
NEA-0204/02
report                   Doc.CEC(68)18 (December 1968)              REPPT
prog. note               SASSI Program Note (4 pages)               NOTPT
report                   SMOG Doc.CEC/63-61-SU-04 (February 1963)   REPPT
user's guide             user's guide                               WRKPT
report                   NEANDC-152"A",INDC(NEA)4 (October 1983)    REPPT
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: Hauser-Feshbach theory, cross sections, elastic scattering, inelastic scattering, neutrons, nuclear models, statistical models.