Studies of the Delayed Neutrons. I. The Decay Curve and the Intensity of the Delayed Neutrons

Abstract
The delayed neutrons resulting from slow neutron fission of uranium have been found to decay as a combination of exponentials with half-lives of 0.4, 1.8, 4.4, 23, and 56 seconds and respective initial relative intensities when activated to saturation of 0.4, 0.5, 1.1, 1.0, and 0.14. Under equilibrium conditions the delayed neutrons are 1.0±0.2 percent as abundant as the instantaneous fission neutrons.