The November 1, 1952 thermonuclear explosion ("Mike") produced all of the uranium isotopes U 239 , U 240 , • • • U 255 through multiple neutron capture by U 238 . The long-lived products of successive 0~ decays from these isotopes were measured mass spectrometrically and radiometrically. The logarithms of the abundances decline smoothly with increasing mass number; the even-mass abundances slightly exceed the geometric mean of adjacent odd-mass abundances. Some nuclear properties of neutron-rich heavy nuclides, not subject to ordinary investigation are inferred.

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