Observation of exotic nuclear decay of (230)~U  

作　　者：YANG Wei-Fan KONG Deng-Ming 等 

机构地区：[1]InstituteofModernPhysics,theChineseAcademyofSciences,Lanzhou730000 [2]InstituteofHighEnergyPhysics,theChineseAcademyofSciences,Beijing100039

出　　处：《Nuclear Science and Techniques》2003年第1期49-52,共4页核技术（英文）

基　　金：Supported by the National Natural Science Foundation of China (No. 10075063) ; Chinese Academy of Sciences (TK95T-03)

摘　　要：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 230Paβ-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.(230)~Pa 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 detectorsearching 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 a decay was deduced, B =λNe/λα = (1.3±0.8)×10^(-14) for 22Ne emission from 230U.

关 键 词：铀230 原子核反应 钯230 反应截面 钍232 反应能量 

分 类 号：O571.413[理学—粒子物理与原子核物理]