Abstract
A survey of the isotope tables for delayed-neutron precursors has been made for odd- Z nuclei having neutron numbers greater than the magic numbers by either two or three. The quantity Q β – B n was calculated for each case from known data or from energy systematics to determine if neutron emission is energitically possible. Among the fourteen non-fission products examined, two are known delayed-neutron precursors. In only one other case, namely 81 209Tl, is there a possibility of delayed-neutron emission. The sixteen fission products considered include four known precursors, two nuclei previously suggested as precursors and three uncertain cases. In all the other cases delayed-neutron emission is energetically impossible.
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