Experimental validation of analytic formulas for the statistical uncertainty in the Feynman-α method

C. Dubi, A. Kolin, P. Blaise, B. Geslot, E. Gilad

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Noise experiments, and the Feynman-α method in particular, are considered a standard in-pile experiment, often used in zero power reactors in a sub critical configuration to estimate the reactivity level. In the Feynman-α method, the variance to mean ratio of event triggered neutron count is fitted on the so called Feynman-Y function, resulting with an experimental estimation of the α decay mode. In a recent study, analytic formulas for the expected statistical uncertainty in the Feynman-α method were derived, using the backward stochastic transport equation. The outline of the present study is to experimentally validate these analytic formulas. The formulas were implemented on 4 different signals, obtained from the MINERVE reactor at CEA Cadarache. For each of the four measurements, the signal was truncated in increasing measurement lengths (ranging from 1 to 60 min), in order to observe the functional behavior of the statistical error through time. Then, the measured statistical error was compared with the analytic estimation. Results indicate a very high correspondence between the expected statistical error and the measured one.

Original languageEnglish
Pages (from-to)84-90
Number of pages7
JournalAnnals of Nuclear Energy
StatePublished - 1 Aug 2017

ASJC Scopus subject areas

  • Nuclear Energy and Engineering


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