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No impact from Savannah River radioactive wasps
The news is abuzz with recent news stories about four radioactive wasp nests found at the Department of Energy’s Savannah River Site in South Carolina. The site has been undergoing cleanup operations since the 1990s related to the production of plutonium and tritium for defense purposes during the Cold War. Cleanup activities are expected to continue into the 2060s.
Ch. Lagrange, O. Bersillon, D. G. Madland
Nuclear Science and Engineering | Volume 83 | Number 3 | March 1983 | Pages 396-401
Technical Note | doi.org/10.13182/NSE83-A17575
Articles are hosted by Taylor and Francis Online.
As coupled-channel calculations are very time consuming when applied to odd-mass target nuclei using the actual level schemes, the adequacy of the following approximation is studied. Calculations are performed for a fictitious even-even nucleus with the same mass number as the odd-mass target of interest. Deformation parameters are obtained from a systematic available in this mass region, and the optical model parameters used are extrapolated from those determined for the neighboring even-even nuclei. Direct elastic and inelastic scattering cross sections resulting from such calculations are distributed among the true ground-state band levels of the odd-mass nucleus. Comparisons of calculations made with a fixed set of optical parameters, but using either the actual or the fictitious level scheme, are presented for ground-state bands of K = 1/2 and K = 5/2. The approximation proposed can be applied with great confidence over the energy range 10 keV to 20 MeV in case of K = 1/2. In case of K = 5/2, the approximation gives satisfactory results in the limited energy range 4 to 20 MeV.