last modified: 01-JAN-1978 | catalog | categories | new | search |

NEA-0511 ACTIV.

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

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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. DESCRIPTION OF PROGRAM OR FUNCTION

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. METHODS

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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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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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

IBM 360 MVT.

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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0511/01 FORTRAN-IV
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15. NAME AND ESTABLISHMENT OF AUTHORS

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.