Estimation of β-decay properties of nuclei far from the stability line

We have been studying -decay properties of nuclei far from the -stability line with the use of the 2nd generation of the gross theory and semi-gross theory. In the 2nd generation of the gross theory, the shell effects of nuclei are included only through the -decay Q-values. On the other hand, in the case of the semi-gross theory, other various shell effects of the parent nucleus are taken into account in the model. We calculate -decay half-lives and delayed neutron emission probabilities which are important for studying the nuclear astrophysics, especially for the calculation of r-process nuclear synthesis. We also calculate -ray and -ray energies released per one β-decay for some fission product nuclei. These are necessary data in the study of reactor physics; e.g. in the summation calculation of decay heat. In this report, some results obtained by using the 2nd generation of the gross theory as well as the semi-gross theory are compared with the experimental data. It is pointed out that these experimental data are useful for examining the calculated β-decay strength function.