RSICC Home Page RDMM

RSICC CODE PACKAGE PSR-598

 

1. NAME AND TITLE

RDMM: Flux Spectra from In-Pile Fast Neutron Activation Experiment.

 

2. CONTRIBUTOR

Commission Des Communautes Europeennes, Ispra, Italy through the OECD Nuclear Energy Agency Data Bank, Issy-les-Moulineaux, France.

3. CODING LANGUAGE AND COMPUTER

Fortran, Assembler; IBM 360/65 Series (P00598I036000).

 

4. NATURE OF 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. RDMM allows the energy dependent flux determination, on the hypothesis that the neutron flux shape can be expanded in a series of linearly independent functions times a weighting function. Moreover it allows one to estimate the effect of experimental input errors on the solution obtained.

 

5. 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.

 

6. RESTRICTIONS OR LIMITATIONS

None listed.

 

7. TYPICAL RUNNING TIME

About 1 minute 30 seconds.

 

8. COMPUTER HARDWARE REQUIREMENTS

IBM 360 /65.

 

9. COMPUTER SOFTWARE REQUIREMENTS

IBM 3760/65 Operating System.

 

10. REFERENCES

a) Included Documentation:

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

 

11. CONTENTS OF CODE PACKAGE

The package is distributed on a CD with a compressed zip file including source files, documentation, sample input and output.

 

12. DATE OF ABSTRACT

December 2013.

 

KEYWORDS: GAUSS FUNCTION, ACTIVATION ANALYSIS, FAST NEUTRONS, LEAST SQUARES FIT, NEUTRON SPECTRA, SERIES EXPANSION