First Observation of β-delayed Proton Decay of Proton Drip Line Nuclide 19Na

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Xu Xiaoji, Ma Ruichang, Huang Wenxue, Hu Zhiqiang, Gu Junsheng, Guo Yingxiang, Xu Lianlian, Liu Hongye, Luo Yixiao, Wang Shuhong, Kong Dengming and Qiao Jimin. First Observation of β-delayed Proton Decay of Proton Drip Line Nuclide 19Na[J]. Chinese Physics C, 1995, 19(S2): 109-114.
Xu Xiaoji, Ma Ruichang, Huang Wenxue, Hu Zhiqiang, Gu Junsheng, Guo Yingxiang, Xu Lianlian, Liu Hongye, Luo Yixiao, Wang Shuhong, Kong Dengming and Qiao Jimin. First Observation of β-delayed Proton Decay of Proton Drip Line Nuclide 19Na[J]. Chinese Physics C, 1995, 19(S2): 109-114. shu
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Received: 1994-11-24
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    Supported by the National Natural Science Foundation of China.

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First Observation of β-delayed Proton Decay of Proton Drip Line Nuclide 19Na

  • 1 Institute of Modem Physics, The Chinese Academy of Sciences, Lanzhou, China;
  • 2 Institute of High-energy Physics, The Chinese Academy of Sciences, Beijing, China
Fund Project:  Supported by the National Natural Science Foundation of China.

Abstract: The nuclide on proton drip line 19Na was studied through a 20Ne(p,2n)19Na reaction. Its new decay mode of β-delayed proton decay was observed for the first time. The proton energy was measured to be 1.10±0.08 MeV and its half-life was determined to be 47±20 ms, which corresponds to a superallowed β transition of l9Na ground state to 19Ne 7.62 MeV isospin analog state with T=3/2, and subsequent proton emission to an 18F ground state.

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