Gamow-Teller transitions of neutron-rich N = 82, 81 nuclei by shell-model calculations
Keyword(s):
Β Decay
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Abstract β-decay half-lives of neutron-rich nuclei around N = 82 are key data to understand the r-process nucleosynthesis. We performed large-scale shell-model calculations in this region using a newly constructed shell-model Hamiltonian, and successfully described the low-lying spectra and half-lives of neutron-rich N = 82 and N = 81 isotones with Z = 42 − 49 in a unified way. We found that their Gamow-Teller strength distributions have a peak in the low-excitation energies, which significantly contributes to the half-lives. This peak, dominated by ν0g7/2 → π0g9/2 transitions, is enhanced on the proton deficient side because the Pauli-blocking effect caused by occupying the valence proton 0g9/2 orbit is weakened.
2013 ◽
Vol 445
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pp. 012028
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2018 ◽
Vol 12
(1)
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pp. 81
2007 ◽
Vol 16
(02)
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pp. 552-560
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