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Improvement of gross theory of beta-decay for application to nuclear data

Koura, Hiroyuki ; Yoshida, Tadashi*; Tachibana, Takahiro*; Chiba, Satoshi*

A theoretical study of $$beta$$ decay and delayed neutron has been carried out with a global $$beta$$-decay model: the gross theory. In a fissioning nucleus, neutrons are produced by the $$beta$$ decay of neutron-rich fission fragments. This is known as delayed neutrons. The gross theory of the $$beta$$ decay is based on a consideration of the sum rule of the $$beta$$-strength function, and gives reasonable results of $$beta$$-decay rates and delayed neutron in the entire nuclear mass region. We re-analyze and improve the theory on the strength functions and one-particle level densities. We focus on the spin-parity of decaying nucleus, and a hindrance treatment is introduced for the allowed transition on parity-mismatching nuclei. By using the improved gross theory, the ability of theoretically reproduction (and also prediction) on $$beta$$-decay rates, delayed-neutron emission probabilities, decay heat, will be discussed. In the process, we make a new code of the gross theory of $$beta$$- decay including the improved parts. We will show the code, which can be distributed for the nuclear data community.

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