NEA-0168 RDMM.

RDMM, Flux Spectra from In-Pile Fast Neutron Activation Experiment

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: RDMM.

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2. COMPUTERS

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Program name	Package id	Status	Status date
RDMM	NEA-0168/01	Tested	01-DEC-1979

Machines used:

Package ID	Orig. computer	Test computer
NEA-0168/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

Measurements of in-pile fast neutron spectra are often obtained by threshold detector irradiations. The threshold detector technique gives data usually expressed as normalized activation rates. The programme RDMM allows the energy dependent flux determination, on the hyphothesis that the neutron flux shape can be expanded in a series of linearly independent functions times a weighting function. Moreover it allows to estimate the effect of experimental input errors on the solution obtained.

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4. METHOD OF SOLUTION

The series expansion coefficients are obtained through the Gauss method by solving a least-squares problem.
A procedure based on the Monte Carlo method is used to statistically study the effect of experimental errors.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

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6. TYPICAL RUNNING TIME: About 1 minute 30 seconds.

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7. UNUSUAL FEATURES OF THE PROGRAM

All the available activation data, independently from the cross section shape may be used.
The solution approximates the activation rates in the best possible way. The results are independent on the particular choice of the functions in the series expansion.

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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-0168/01	01-DEC-1979	Tested at NEADB

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10. REFERENCES

NEA-0168/01, included references:

- G. Di Cola and A.Rota:
  A Code for Fast Neutron Spectra Determination by Activation
  Analysis
  EUR 2985.e (1966).

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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0168/01	FORTRAN+ASSEMBLER

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: IBM 360/65 Operating System.

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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

        G. Di Cola
        Commission Des Communautes Europeennes
        CETIS
        21020 - Ispra
        Italy

        A. Rota
        Commission Des Communautes Europeennes
        Nuclear Chemistry
        21020 - Ispra
        Italy

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16. MATERIAL AVAILABLE

NEA-0168/01

File name	File description	Records
NEA0168_01.001	SOURCE&DATA&LIBRARY	769
NEA0168_01.002	OUTPUT	369

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17. CATEGORIES

O. Experimental Data Processing

Keywords: Gauss function, activation analysis, fast neutrons, least square fit, neutron spectra, series expansion.