Abstract
The neutron capture cross sections at an effective energy of one Mev have been measured for 32 isotopes, including 4 isomeric pairs. Unmoderated fission neutrons were used as the source, and the high intensities available by this method have made it possible to measure fast cross sections as low as ${10}^{\ensuremath{-}4}$ barn. The cross sections (except those for a few "magic number" nuclei) show a smooth variation with atomic weight, ranging from ${10}^{\ensuremath{-}1}$ b at $A=100$ to ${10}^{\ensuremath{-}4}$ b at $A=20$. The rapid change in cross section is a measure of the change in level spacing of the compound nucleus formed after neutron capture. A survey is made of all the existing data on absorption cross sections as functions of $A$ and neutron energy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
