Abstract
The average number of neutrons per thermal neutron fission, $\overline{\ensuremath{\nu}}$, was measured for ${\mathrm{Am}}^{242m}$ with the use of a spark-chamber fission detector and a paraffin-moderated neutron detector. The value obtained is 3.24\ifmmode\pm\else\textpm\fi{}0.12 neutrons per fission. To check the method, measurements also were made on ${\mathrm{U}}^{235}$ and ${\mathrm{U}}^{233}$, which gave 2.43\ifmmode\pm\else\textpm\fi{}0.08 and 2.54\ifmmode\pm\else\textpm\fi{}0.04 neutrons per fission, respectively.
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