Theoretical-experimental neutron spectrum comparisons by an orthonormal series expansion method Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/st74ct41t

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  • This thesis presents and discusses a method for comparing the neutron flux of some calculational model with the actual flux of a critical system. Both the theoretical and experimental aspects of this method are investigated in this report. Experiments were performed to find neutron energy dependent data. These involved the irradiation of gold and copper detectors in covering solutions which contained various concentrations of a boron absorber (0≤₅B¹⁰≤12 g/l). Irradiations were made in two critical systems which were spectrally different. Transport theory computer calculations were made to obtain the information for the calculational model. Flux comparisons were then made by means of an orthonormal series expansion. The resulting analysis showed a strong instability in the orthonormal method due to near linear dependence in the detector activation cross sections and a lack of significant figures in the computer calculations. This problem is discussed and possible remedies are suggested.
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