A Comprehensive Approach to Estimate Delayed-neutron Data of Actinides and Minor-actinides

A project is described on a comprehensive approach to improve accuracy of delayed-neutron data of actinides and minor actinides by the summation calculations. This project consists of 1) measurement of fission fragment mass distribution (FFMD) of nuclei for which direct measurements using neutrons are not practical, 2) estimation of independent fission yields by developing a dynamical model of fission, 3) improvement of a β-decay theory for better reproductions of decay characteristics of fission fragments, 4) nuclear data evaluation based on the above activities and summation calculations of decay-heat and delayed neutron data and 5) benchmark by using reactor data. Through these activities, understanding of the basic fission process will be advanced as well.