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- W2020135384 abstract "Within the framework of the MUSE program, Feynman-α measurements were performed on the critical fast reactor MASURCA. The pres and cons of two measurement methods are described. Because of the low count rate, measurements recording the time interval between neutron pulses have preference compared with measurements that record the neutron counts in adjacent time intervals. The latter method requires much more disk space while less information is stored. Independent of the measurement method, it turned out that each detected neutron gave a TTL pulse and an echo pulse with a delay of about 120 ns. A correction to the variance-to-mean ratio has been derived, and the experimental setup was tuned to avoid these echoes in later measurements. The measurement method that records the time interval between neutron counts can be used to artificially increase the detector dead time. In principle, such measurement data can be used to measure the dependence of the correlated part of the variance-to-mean ratio on dead time. However, in our case, it was only possible to extract the dependence of the uncorrelated part on dead time. A good agreement was found between the measurements and theory. The value for the prompt neutron decay constant as measured with two detectors in the reflector region of the core reach about 5780±264 s−1, which agrees quite well with the expected values for the delayed neutron fraction (β≈0.33%) and the neutron generation time (≈0.55 μs). Repeated measurements with more sensitive detectors at the same positions gave consistently a lower value for the one detector and a higher value for the other. An explanation for this is not yet found." @default.
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- W2020135384 date "2005-01-01" @default.
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- W2020135384 title "Feynman-α measurements on the fast critical zero-power reactor masurca" @default.
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- W2020135384 doi "https://doi.org/10.1016/j.pnucene.2005.01.002" @default.
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