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[Program Service | Recent programs]

NEA-0511 ACTIV. (Abstract last modified 01-JAN-1978)


ACTIV, Sandwich Detector Activity from In-Pile Slowing-Down Spectra Experiment

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Abstract Table of Contents:

NAME | COMPUTER | PROBLEM | SOLUTION | RESTRICTIONS | CPU | FEATURES | AUXILIARIES | STATUS | REFERENCES | REQUIREMENTS | LANGUAGE | OPERATING SYSTEM | OTHER RESTRICTIONS | AUTHOR | MATERIAL | CATEGORIES |

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1. NAME OR DESIGNATION OF PROGRAM - ACTIV.


2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name         Package-ID  Status
ACTIV                NEA-0511/01 Tested

Machines used:
Package-ID     Orig.Computer                       Test Computer
NEA-0511/01    IBM 370 series                      IBM 370 series

3. NATURE OF PHYSICAL PROBLEM SOLVED - Calculates the activities of a sandwich detector, to be used for in-pile measurements in slowing-down spectra below a few keV. The effect of scattering with energy degradation in the filter and in the detectors has been included to a first approximation.


4. METHOD OF SOLUTION -
An iterative procedure is used: the calculation starts with a flux guess in which one assumes that each measured reactivity difference depends on the principal resonance only. The secondary resonance contribution is computed through the iterative process. For self-shielded cross-section calculations the model of Pearlstein and Weinstock (ref. 3) is used. The neutron spectrum can optionally be constant or 1/E inside each finite energy group relative to the resonance considered.


5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - Maximum number of energy groups : 60.


6. TYPICAL RUNNING TIME -


7. UNUSUAL FEATURES OF THE PROGRAM - Sandwiches with an arbitrary number of foils surrounded by neutron absorbing filters can be calculated.


8. RELATED AND AUXILIARY PROGRAMS -


9. STATUS
NEA-0511/01: 01-JAN-1978 Tested at NEADB


10. REFERENCES  - 
- S.Pearlstein, E.V.Weinstock:
  Nucl.Sci.Eng. 29(1967) 28.
NEA-0511/01:
- L.Bozzi, F.Caporella, M.Cosimi:
  Il codice ACTIV
  CNEN - RT/F1(73)35.
- L.Bozzi, F. Caporella, M.Cosimi, M.Martini:
  An Interpretational Technique of Sandwich Activation Measurements
  Reprint from Nucl.Instr.Meth. 119(1974) 599 - 604.


11. MACHINE REQUIREMENTS -


12. PROGRAMMING LANGUAGE(S) USED -
NEA-0511/01: FORTRAN-IV 


13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED - IBM 360 MVT.


14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS -


15. NAME AND ESTABLISHMENT OF AUTHOR -
 L. Bozzi et al.
 Centro di Studi Nucleari della Casaccia
 Roma, Italy


16. MATERIAL AVAILABLE -
NEA-0511/01:
NEA0511_01.001    SOURCE PROGRAM F4-EBCDIC                          651 records
NEA0511_01.002    JCL                                                11 records
NEA0511_01.003    SAMPLE PROBLEM DATA                                75 records
NEA0511_01.004    SAMPLE PROBLEM PRINTED OUTPUT                    1694 records


17. CATEGORIES  - 

- O.  Experimental Data Processing


Keywords: ITERATIVE METHODS, NEUTRON DETECTORS, NEUTRON SPECTRA, SCATTERING, SLOWING-DOWN

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