last modified: 01-DEC-1979 | catalog | categories | new | search |

NEA-0168 RDMM.

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

top ]
1. NAME OR DESIGNATION OF PROGRAM:  RDMM.
top ]
2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
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
top ]
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.
top ]
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.
top ]
5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
top ]
6. TYPICAL RUNNING TIME:  About 1 minute 30 seconds.
top ]
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.
top ]
8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
top ]
9. STATUS
Package ID Status date Status
NEA-0168/01 01-DEC-1979 Tested at NEADB
top ]
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).
top ]
11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
top ]
12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0168/01 FORTRAN+ASSEMBLER
top ]
13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 360/65 Operating System.
top ]
14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
top ]
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
top ]
16. MATERIAL AVAILABLE
NEA-0168/01
File name File description Records
NEA0168_01.001 SOURCE&DATA&LIBRARY 769
NEA0168_01.002 OUTPUT 369
top ]
17. CATEGORIES
  • O. Experimental Data Processing

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