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The β Decay of 21N |
LOU Jian-Ling1;LI Zhi-Huan1;YE Yan-Lin1;JIANG Dong-Xing1;HUA Hui1;LI Xiang-Qing1;ZHANG Shuang-Quan1;ZHENG Tao1;GE Yu-Chen1;KONG Zan1;LV Lin-Hui1;LI Chen1;LU Fei1;FAN Feng-Ying1;LI Zhong-Yu1;CAO Zhong-Xin1;MA Li-Ying1;Faisal1;XU Hu-Shan2;HU Zheng-Guo2; WANG Meng2;LEI Xiang-Guo2;DUAN Li-Min2;XIAO Zhi-Gang2;ZHAN Wen-Long2;XIAO Guo-Qing2;HUANG Tian-Heng2;FU Fen2;ZHANG Xue-Heng2;ZHENG Chuan2, YU Yu-Hong2;TU Xiao-Lin2;ZHANG Ya-Peng2;YANG Yan-Yun2;ZHANG Hong-Bin2;TANG Bin2;TIAN Yu-Lin2;OU Yang-Zhen2; HUANG Mei-Rong2;XU Zhi-Guo2;YUE Ke2;GAO Qi2 |
1School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 1008712Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 |
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Cite this article: |
LOU Jian-Ling, LI Zhi-Huan, YE Yan-Lin et al 2008 Chin. Phys. Lett. 25 1992-1995 |
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Abstract The β-delayed neutron and γ energy spectra taken from the decay of neutron-rich nucleus 21N were measured by using the β-γ and β-n coincidence detection method. Thirteen new neutron groups ranging from 0.28MeV to 4.98MeV and with a total branching ratio of 88.7±4.2% were observed and presented. One γ transition with an energy of 1222keV emitted from the excited state of 21O, and four γ transitions with energies of 1674, 2397, 2780, and 3175keV emitted from the excited states of 20O were identified in the β decay chain of 21N. The β decay half-life for 21N is determined to be 82.9±1.9ms. The uncertainty of half-life is much smaller than the previous result.
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Keywords:
21.10.Pc
23.40.-s
27.30.+t
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Received: 17 December 2007
Published: 31 May 2008
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PACS: |
21.10.Pc
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(Single-particle levels and strength functions)
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23.40.-s
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(β-decay;double β-decay; electron and muon capture)
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27.30.+t
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(20 ≤ A ≤ 38)
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