Decay modes and a limit of existence of nuclei in the superheavy mass region

Koura, Hiroyuki   

We have developed an original model based on the macroscopic + mean-field models to describe the global feature of nuclear masses, called as the KTUY (Koura-Tachibana-Uno-Yamada) nuclear mass mode. The standard deviation from known masses is 0.67 MeV, and below 0.4 MeV from some separation energies. By using the KTUY model, we have studied decay modes for -decay, -decay, proton emission and spontaneous fission ranging from light nuclei to superheavy nuclei including unknown ones, and estimated the dominant nuclear decay modes. We calculated total half-lives of nuclei and we determined the number of nuclei depending on the half-life range. For example, the total number of nuclei with more than one nanosecond is estimated to be approximately eleven thousands. That with more than one millisecond is approximately eight thousands, etc.