ß--delayed fission in the coupled quasiparticle random-phase approximation plus

Beta-delayed neutron emission and ss-delayed fission (ss df) probabilities were calculated for heavy, neutronrich nuclei using the Los Alamos coupled quasiparticle random-phase approximation plus Hauser-Feshbach (QRPA + HF) approach. In this model, the compound nucleus is initially populated by ss decay and is followed through subsequent statistical decays taking into account competition among neutrons, gamma rays, and fission. The primary output of these calculations includes branching ratios along with neutron and gamma-ray spectra. We find a relatively large region of heavy nuclides where the probability of ss df is near 100%. For a subset of nuclei near the neutron drip line, delayed neutron emission and the probability of fission are both large, which leads to the possibility of multichance ss df (mc-ss df). We comment on prospective neutron-rich nuclei that could be probed by future experimental campaigns and provide a full table of branching ratios in ASCII format in the Supplemental Material for use in various applications.