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A new nuclear reaction for the production of  240 Am was experimentally investigated. Targets of 150 – 500  μ g/cm 2  242 Pu on 2  μ m Ti were produced through molecular deposition. Five irradiations, in which  242 Pu,  nat Ti, and  nat Ni targets were jointly activated with protons from the Lawrence Berkeley National Laboratory 88-Inch Cyclotron produced  240 Am,  48 V, and  57 Ni, respectively. The radioactive decay of these nuclides was monitored using high-purity Ge gamma ray detectors in the weeks following irradiation.  A maximum  242 Pu( p , 3 n ) 240 Am nuclear reaction cross section was measured to be 45 ± 13 mb with 23 MeV protons. While this value is lower than theoretical predictions, it is high enough to be the most viable nuclear reaction for the large-scale production of  240 Am.

Measurement of the 240 Am production cross section via proton irradiation of 242 Pu