Thermal neutron capture cross sections of long-lived nuclei measured by activation

Krane, Kenneth S.
July 2000
AIP Conference Proceedings;2000, Vol. 529 Issue 1, p111
Academic Journal
Thermal neutron capture cross sections have been measured for many radioactive nuclei using the activation technique, in which one compares the activity of the original radioactive nucleus [sup A]X with that of the nucleus [sup A+1]X which is produced by neutron capture. These measurements have previously been done either by irradiating long-lived sources or by double neutron capture on a stable target (in which case one compares the activity of the final product with that of the intermediate radionuclide). These techniques are made practical if the final product nucleus is much shorter-lived than the original nucleus (or than the intermediate radionuclide in the case of double neutron capture), so that it decays at a greater rate. Both methods require precise knowledge of decay schemes and branching ratios of the observed radiations, as well as detailed information on isomerism in all radionuclides involved in the measurement. Some results of a critical review of previous activation measurements of thermal cross sections will be presented, along with results of measurements in our laboratories of the cross sections of the following long-lived radionuclides: [sup 32]Si(172 y), [sup 44]Ti(60 y), [sup 68]Ge(271 d), [sup 148]Gd(75 y), and [sup 166m]Ho(1200 y). © 2000 American Institute of Physics.


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