NEA-0511 ACTIV.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, CPU, 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: ACTIV.

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2. COMPUTERS

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Program name	Package id	Status	Status date
ACTIV	NEA-0511/01	Tested	01-JAN-1978

Machines used:

Package ID	Orig. computer	Test computer
NEA-0511/01	IBM 370 series	IBM 370 series

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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.

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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.

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

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6. TYPICAL RUNNING TIME

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7. UNUSUAL FEATURES OF THE PROGRAM

Sandwiches with an arbitrary number of foils surrounded by neutron absorbing filters can be calculated.

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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-0511/01	01-JAN-1978	Tested at NEADB

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10. REFERENCES: - S.Pearlstein, E.V.Weinstock:, Nucl.Sci.Eng. 29(1967) 28.

NEA-0511/01, included references:

- 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.

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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0511/01	FORTRAN-IV

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

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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

L. Bozzi et al.
Centro di Studi Nucleari della Casaccia
Roma, Italy

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16. MATERIAL AVAILABLE

NEA-0511/01

File name	File description	Records
NEA0511_01.001	SOURCE PROGRAM F4-EBCDIC	651
NEA0511_01.002	JCL	11
NEA0511_01.003	SAMPLE PROBLEM DATA	75
NEA0511_01.004	SAMPLE PROBLEM PRINTED OUTPUT	1694

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17. CATEGORIES

O. Experimental Data Processing

Keywords: iterative methods, neutron detectors, neutron spectra, scattering, slowing-down.