Nuclear Science and Techniques ›› 2003, Vol. 14 ›› Issue (1):
• NUCLEAR, HEAVY ION AND ATOMIC PHYSICS •
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
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.
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