摘要
用１４ＭｅＶ中子轰击钍靶，通过￣（２３２）Ｔｈ（ｎ，α）￣（２２９）Ｒａ反应产生￣（２２９）Ｒａ，由放射化学分离技术从被照靶物质中分离出￣（２２９）Ｒａ活性；利用γ（Ｘ）谱学方法，首次观测到了￣（２２９）Ｒａ的能量为１４．５、１５．６、１８．８、２１．８、２２．５、４４．０、４７．５、５５．０、６３．０、６９．６、９３．６、９４．１、９８．５、１０２．２、１０４．５、１０６．１、１６１．１和１７１．５ｋｅＶ的１８条新衰变γ射线，并建立了￣（２２９）Ｒａ的部分衰变纲图．
The￣(229)Ra has been produced in the￣(232)Th (n,α)￣(229)Ra reaction by 14 Mev neutron irradiation of natural Thorium.The￣(229)Ra activities were separated from irradiated target material by radiochemical separation technique. The 18 new γ rays of !(229)Ra decay with energies of 14. 5, 15. 6, 18. 8, 21. 8, 22. 5, 44. 0, 47. 5, 55. 0, 63. 0, 69. 6, 93. 6, 94. 1,98. 5, 102. 2, 104. 5, 106. 1, 161. 1 and 171. 5 keV were found for the first take by using y (X ) spectroscopic methods and assigned to the ￣(229)Ra decay. A partial decay scheme of ￣(229)Ra was proposed.
基金
国家自然科学基金资助课题
中国科学院八五重大项目
关键词
Γ衰变
化学分离
衰变纲图
八极形变
转动带
γ decay
chemical separation
decay scheme
octupole deformation
rotational band
