1. NAME AND TITLE
ACTIV: Sandwich Detector Activity from In-Pile Slowing-Down Spectra Experiment.
di Studi Nucleari della Casaccia, Roma, Italy through the OECD Nuclear Energy
Agency Data Bank, Issy-les-Moulineaux, France.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; IBM 370 Series (P00590I037000).
4. NATURE OF PROBLEM SOLVED
ACTIV 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.
5. 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.
6. RESTRICTIONS OR LIMITATIONS
Maximum number of energy groups: 60.
7. TYPICAL RUNNING TIME
8. COMPUTER HARDWARE REQUIREMENTS
IBM 360 or IBM 370 mainframe.
9. COMPUTER SOFTWARE REQUIREMENTS
a) Included Documentation:
L.Bozzi, F.Caporella, M.Cosimi: Il Codice ACTIV CNEN - RT/F1(73)35.
b) Background Documentation:
- L.Bozzi, F. Caporella, M.Cosimi, M.Martini: An Interpretational Technique of Sandwich Activation Measurements Reprint from Nucl.Instr.Meth. 119(1974) 599 - 604.
-S.Pearlstein, E.V.Weinstock:, Nucl.Sci.Eng. 29(1967) 28.
11. CONTENTS OF CODE PACKAGE
The package is distributed on a CD with a compressed zip file including source files, JCL, documentation, and test cases.
12. DATE OF ABSTRACT
KEYWORDS: ITERACTIVE METHODS; NEUTRON DETECTORS; NEUTRON SPECTRA; SCATTERING; SLOWING-DOWN