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NEA-0302 HEITLER.

HEITLER, Compton Cross-Sections, Photoelectric Cross-Sections, Pair-Production Cross-Sections, Total Cross-Sections

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1. NAME OR DESIGNATION OF PROGRAM:  HEITLER.
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2. COMPUTERS
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Program name Package id Status Status date
HEITLER NEA-0302/01 Report 04-NOV-1996

Machines used:

Package ID Orig. computer Test computer
NEA-0302/01 IBM 7030
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3. NATURE OF PHYSICAL PROBLEM SOLVED

Subroutine HEITLER computes, for  any element, the Compton, photoelectric, pair-production, and total microscopic cross-sections. It also computes either the Compton absorption cross-section or the Klein-Nishina differential scattering cross-section.
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4. METHOD OF SOLUTION

The Compton cross sections are calculated theoretically from the Klein-Nishina equation. The photoelectric and pair-production cross-sections are obtained by suitable interpolation in atomic number and energy using a compilation of 25 sets (more or less) of measured cross-sections.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The range of atomic numbers is from 1 to 94 inclusive.
The range of photon energy is from 10 keV to 20 MeV inclusive.
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6. TYPICAL RUNNING TIME
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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM
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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-0302/01 04-NOV-1996 Report Only
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10. REFERENCES
NEA-0302/01, included references:
- A. Foderaro
  Subroutine Heitler
  AERE-M1956 (September, 1967)
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0302/01 FORTRAN-STRETCH (IBM-7030)
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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

        A. Foderaro
        Research Reactors Division
        Atomic Energy Research Establis.
        Harwell, Berkshire
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16. MATERIAL AVAILABLE
NEA-0302/01
source program   listing Source program   listing                   SRCLS
report                   Report AERE-M1956 (September, 1967)        REPPT
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17. CATEGORIES
  • A. Cross Section and Resonance Integral Calculations

Keywords: Compton effect, absorption, cross sections, interpolation, klein-nishina formula.