Calculation of beta decay half-lives and delayed neutron branching ratio of fission fragments with Skyrme-QRPA

Minato, Futoshi   

Nuclear beta-decay and delayed neutron (DN) emission is important for the -process nucleosynthesis after the freeze-out and stable and safe operation of nuclear reactors. Even though radioactive beam facilities have enabled us to measure beta-decay and DN branching ratio of neutron-rich nuclei apart from the stability line in the nuclear chart, there are still a lot of nuclei which one cannot investigate. In particular, information on DN is rather scarce than that of . To predict and DN branching ratios, we recently developed a method which comprises QRPA and Hauser-Feshbach model. In this work, we calculate fission fragments with . We obtain the RMS deviation from experimental half-life of 5.06. However, there are odd-even staggering when looking at theoretical along an isotopic chain, which is not observed experimentally. There are also deviations of DN branching ratios. We discuss the cause of these problems and how to remedy them.