寻找~(230)U的集团衰变

Search for Cluster Dacay of ~(230)U

摘要: 使用35MeV质子轰击ThO2,通过232Th(p,3n)230Pa反应产生目标核。用放射化学分离法从靶材料和其它反应产物中分离Pa,制备薄的Pa源。用HPGe探测器测量Pa源的γ能谱,使用聚乙烯对苯二酸酯(PTEP)固体径迹探测器记录重离子径迹,首次发现了230U发射22Ne离子的稀有衰变模式,并获得了它相对于α粒子发射的分支比为(1.3±0.8)×10-14。

Abstract: 230Pa can be produced via the 232Th(p,3n)reaction by 35 MeV proton bombardment of natural thorium. Pa is separated radiochemically and six thin sources of 230Paβ230U are prepared. The γ spectrum of Pa sources are measured by a HPGe detector. Using PETP trackrecording films, the rare 22Ne decay mode of 230U is discovered for the first time. The branching ratio (B) relative to α decay is B=λNe/λα=(1.3±0.8)×10-14 for 230U.