科研之友
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摘要
A new nuclear reaction for the production of Am-240 was experimentally investigated. Targets of 150-500 mu g/cm(2) Pu-242 on 2 mu mTi were produced through molecular deposition. Five irradiations, in which Pu-242, Ti-nat, and Ni-nat targets were jointly activated with protons from the Lawrence Berkeley National Laboratory 88-Inch Cyclotron produced Am-240, V-48, and Ni-57, respectively. The radioactive decay of these nuclides was monitored using high-purity Ge gamma ray detectors in the weeks following irradiation. A maximum Pu-242(p, 3n)Am-240 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 Am-240.
- 出版日期2014-7
