Radioactive Decay Calculations from the Independent Fission Product Yield

This talk will give a brief introduction of radioactive decay calculations. We developed a Python package for radioactive decay calculations from the independent yields, Y_I(Z,A,M), by keeping track of the inventory including isomeric states, M. It supports decay chains of radio nuclides, metastable states, and branching decays. By default it reads the ENDF-6 format decay data and convert into simple text or JSON format, and then create a decay chain from a particular fission product. The code solves the Bateman equation analytically. To undergo from Y_I(Z,A,M) to the cumulative yields, Y_C(Z,A,M), a time-independent calculation is performed. The outputs are Y_C(Z,A,M), decay heats from gamma and beta ray components, and delayed neutron yield. The code includes a plot method for drawing decay chain diagrams. We also developed a web tools for the nuclear data visualizations, which is mostly for the cross sections, but also [fission product yields][1]. [1]: https://nds.iaea.org/dataexplorer/fy