A theoretical study has been carried out on delayed neutrons. Such neutrons are produced by β decay of neutron-rich fission fragments. The average number of delayed neutrons is estimated based on the sum of the β-delayed neutron-emission probabilities multiplied by the cumulative fission yield for each nucleus. Using the gross theory of β decay, the ability to theoretically reproduce the β-decay rate and the delayed neutron emission probability is discussed.
Koura, H., & Chiba, S. (2015). Theoretical Study of Beta Decay for Delayed Neutron. In Energy Procedia (Vol. 71, pp. 228–236). Elsevier Ltd. https://doi.org/10.1016/j.egypro.2014.11.874