Year
2011
Abstract
The determination of a correlation between neutron energy from fission sources is desirable because it can be used for improving simulation tools, such MCNP and Geant, which may not currently take this into consideration. A multi-trigger experiment, utilizing a californium-252 source, was performed only storing the events which included three particles. The neutrons in the measured triples were used to create neutron pulse height distributions. The average neutron pulse heights for the single, double, and triple neutrons detected were compared. The observed average neutron pulse height for detected neutron singles was larger than that of the doubles and triples. Further investigation using a known neutron light correlation curve showed, on average, that the incoming energy of three neutrons detected in a triple had a 90-keV decrease in energy compared to the neutron singles. Excellent agreement was found between the average measured and simulated (MCNPX-PoliMi) neutron pulse heights a good agreement was found between pulse height distributions.