Abstract
A thermal-neutron fission cross section of 4.4\ifmmode\pm\else\textpm\fi{}0.5 barns for isotopically pure ${\mathrm{Pu}}^{240}$, formed by the ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay of ${\mathrm{U}}^{240}$, has been measured in the thermal column of the Materials Testing Reactor.
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