- th / 0 40 90 19 v 1 9 S ep 2 00 4 The β - delayed neutron emission in 78 Ni region
نویسنده
چکیده
A systematic study of the total β-decay half-lives and β-delayed neutron emission probabilities is performed. The β-strength function is treated within the self-consistent density-functional + continuum-QRPA framework including the Gamow-Teller and first-forbidden transitions. The experimental total β-decay half-lives for the Ni isotopes with A ≤76 are described satisfactorily. The half-lives predicted from A=70 up to A=86 reveal fairly regular A-behaviour which results from simultaneous account for the Gamow-Teller and first-forbidden transitions. For Z ≈ 28 nuclei, a suppression of the delayed neutron emission probability is found when the N=50 neutron closed shell is crossed. The effect originates from the high-energy first-forbidden transitions to the states outside the Qβ − Sn-window in the daughter nuclei. Typeset using REVTEX
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