NEA-0302 HEITLER.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, CPU, FEATURES, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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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.