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SEPARATION AND IDENTIFICATION OF A NEW ISOTOPE 238Th
1999
用60MeV/u 18O离子轰击天然铀靶,通过多核子转移反应产生重丰中子新核素238Th.采用放射化学分离方法从铀和反应产物中分离钍,用HPGe探测器做γ单谱时间序列谱测量,在测得的Th样品的γ谱中观察到了238Th衰变子体238Pa的1060.5keV γ射线的生长和衰变.从而鉴别了新丰中子核素238Th,并确定其半衰期为(9.4±2.0)min.
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