Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2003, Vol. 14 ›› Issue (1): 49

• NUCLEAR, HEAVY ION AND ATOMIC PHYSICS • Previous Articles     Next Articles

Observation of exotic nuclear decay of 230U

YANG Wei-Fan1, PAN Qiang-Yan1, MA Tao-Tao1, YUAN Shuang-Gui1, GUO Jun-Sheng1, KONG Deng-Ming2, QIAO Ji-Min2, LUO Zi-Hao2, ZHANG Mu-Tian2, WANG Shu-Hong2   

  1. 1Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000
    2Institute of High Energy Physics, the Chinese Academy of Sciences, Beijing 100039
  • Supported by:
    Supported by the National Natural Science Foundation of China (No.10075063) and by the Chinese Academy of Sciences (TK95T-03)
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YANG Wei-Fan, PAN Qiang-Yan, MA Tao-Tao, YUAN Shuang-Gui, GUO Jun-Sheng. Observation of exotic nuclear decay of 230U.Nuclear Science and Techniques, 2003, 14(1): 49

Abstract: 230Pa was produced through the 232Th(p,3n)230Pa reaction in the irradiated ThO2 powder targets with 35 MeV proton beam. Pa was radiochemically separated from ThO2 and other reaction products, and then thin sources of 230Pa→230U were prepared. The polyethylene-terephthalate (lavsan) films were selected as solid track detector searching for the cluster activity of 230U. The gamma activity of 230Pa in the sources was measured using a HPGe detector. The lavsan films were etched in NaOH solution and the etched films were scanned under an optical microscope. The exotic nuclear decay of 230U by emission of 22Ne was observed. A branching ratio relative to α decay was deduced, B =λNe/λα= (1.3±0.8)×10-14 for 22Ne emission from 230U.

Key words: 230U, 22Ne emission, 232Th(p,3n)230Pa reaction