التفاصيل البيبلوغرافية
| العنوان: |
Auto-correlation and variance-to-mean measurements in a subcritical core obeying multiple alpha-modes |
| المؤلفون: |
Berglöf, Carl1 calle@neutron.kth.se, Fernández-Ordóñez, Manuel2, Villamarín, David2, Bécares, Vicente2, González-Romero, Enrique M.2, Bournos, Victor3, Muñoz-Cobo, José-Luis4 |
| المصدر: |
Annals of Nuclear Energy. Feb2011, Vol. 38 Issue 2/3, p194-202. 9p. |
| مصطلحات موضوعية: |
*AUTOCORRELATION (Statistics), *NEUTRONS, *PHYSICS experiments, *METHODOLOGY, *ALPHA rays, *ALPHA decay, *NEUTRON sources, *NUCLEAR reactor reactivity |
| مستخلص: |
Abstract: Neutron noise measurements based on the Rossi-α and Feynman-α methodologies have been performed in a heterogeneous subcritical system. It is shown that the traditional single alpha-mode formulations of the Rossi-α and Feynman-α methods are not applicable due to the presence of higher alpha-modes. Formalisms taking into account multiple alpha-modes are applied resulting in satisfactory results. Three alpha-modes could be identified using the Rossi-α method, whereas only two could be obtained using the Feynman-α method. In the Feynman-α case, the possibility to obtain the fastest decaying alpha-mode was diminished due to detector dead time effects. It was found that the slowest decaying alpha-mode does not exactly correspond to the prompt decay found in pulsed neutron source measurements, which confirms the results of previous studies. Strengths and weaknesses of the multiple alpha-mode Rossi-α and Feynman-α methods observed in this study are pointed out. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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