Abstract
WITH the exception of a few cases (lithium-9, nitrogen-17 and thallium-210) all delayed neutron precursors so far identified1 have been found among nuclides with two or more neutrons in excess of the major closed shells (50 and 82). The theory of delayed neutron emission probabilities given by Pappas2 and the subsequent general systematics of delayed neutron precursors developed by Pappas and Rudstam3 predict, however, that delayed neutron emission should be much more common among neutron-rich nuclides than had been anticipated earlier. Delayed neutron precursors are now expected to appear from the lightest to the heaviest nuclides on the neutron-rich side of the β-stability line. The distance from it in Z should be from about 3 to about 7 charge units, depending on the neutron number3. A search was therefore made experimentally for some of these precursors.
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