Experiment measures the energy spectrum of neutrons emitted from neutron-induced fission. The results of the Chi-Nu physics experiment at the Department of Energy’s Los Alamos National Laboratory have contributed essential, never-before-observed data for enhancing nuclear security applications, u
Jaime Gomez and Keegan Kelly work to set up the Chi-Nu experiment, calibrating detector distances and installing gas lines for the fission-counting target . Credit: Los Alamos National LaboratoryThe results of the Chi-Nu physics experiment at the Department of Energy’shave contributed essential, never-before-observed data for enhancing nuclear security applications, understanding criticality safety, and designing fast-neutron energy reactors.
The Los Alamos team’s final Chi-Nu study, on the isotope uranium-238, was recently published in the journal. The experiment measured uranium-238’s prompt fission neutron spectrum: the energy of the neutron inducing the fission — the neutron that crashes into a nucleus and splits it — and the potentially wide-ranging energy distribution of the neutrons released as a result.
Actinide elements, and the chain reactions they can undergo, are important for nuclear weapons and energy reactors. When a nucleus undergoes fission, or splits, several neutrons are released, potentially inducing fission in neighboring nuclei to create the chain reaction. The probability of subsequent reactions in the chain depends on the energy of the fission neutrons.
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