β-decay studies of the neutron-rich ~(18,21)N isotopes |
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基金项目: | supported by the National Basic Research Program of China (Grant No. 2007CB815002); the National Natural Science Foundation of China (Grant Nos. 10775003, 10475004, 10735010, 10775005, 10875002, and 10827505) |
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摘 要: | The β-decay studies of neutron-rich 18,21N isotopes have been performed using β-n, β-γ, and β-n-γ coincidence methods. The 18,21N ions were produced by the fragmentation of the 22Ne and 26Mg beams, respectively, on a thick beryllium target. The time of flight of the emitted neutrons following the β-decay of 18,21N was measured by a neutron detector system with wide energy detection range and low-energy detection threshold. In addition, several clover germanium detectors were used to detect the β-delayed γ-r...
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关 键 词: | β-delayed neutron decay 18 21N neutron detector system branching ratio Gamow-Teller strength |
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