Fast Neutron Reactions with Fluorine and Sodium

The yields of the (np) and (nα) reactions in fluorine and sodium have been measured by observations on the radioactivity produced by bombardment with neutrons from the (dn) reactions in Li, B, Be and D. Cross sections have been estimated and methods of deriving the absolute disintegration rates and the neutron flux are described. The reaction energies have also been derived, by assuming a particular form for the excitation function, and using published data on the energy distribution of the neutrons used.