~(229)Ra的衰变

用１４ＭｅＶ中子轰击钍靶，通过２３２Ｔｈ（ｎ，α）２２９Ｒａ反应产生２２９Ｒａ，用放射化学方法从被照靶物质中分离出２２９Ｒａ。利用γ（Ｘ）谱学方法，首次观测到了能量分别为１４．５，１５．６，１８．８，２１．８，２２．５，４４．０，４７．５，５５．０，６３．０，６９．６，９３．６，９４．１，９８．５，１０２．２，１０４．５，１０６．１，１６１．１，１７１．５ｋｅＶ的２２９Ｒａ衰变的１８条新γ射线，建立了２２９Ｒａ的部分衰变纲图。Ra is produced in the 232 Th(n,α) 229 Ra reaction using 14 MeV neutron irradiation of natural thorium. The 229 Ra activities are radiochemically separated from the irradiated target material. 18 new γ rays of 229 Ra decay with the 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, 171.5 keV are found for the first time. A partial decay scheme of 229 Ra is proposed.中国科学院八五重大项目,国家自然科学基

~(229)Ra的衰变纲图

用１４ＭｅＶ中子轰击Ｔｈ靶，通过￣（２３２）Ｔｈ（ｎ，ａ）反应产生了￣（２２９）Ｒａ，由放射化学分离技术从被照靶物质中分离出￣（２２９）Ｒａ的活性，利用γ（Ｘ）谱学方法，首次观测到了属于￣（２２９）Ａｃ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、１７１．５ｋｅＶ的１８条新衰变γ射线，并建议了￣（２２９）Ｒａ的部分衰变纲图。The 229ra has been produced in the 232 th(n,a)229Ra reaction by 14MeV neutronirradiation of natural Thorium. The 229Ra activities were separated from irradiatedtarget material by radiochemical separation technique. 18 new γ rays with energies14.5,15.6,18.8,21.8,22.5,44.0,47.5,55.0,63.0,69.6,93.6,94.1,98.5,102.2,104.5,106.1,161.171.5keV attributed to the 229Ac were observed for the first timeby usin γ(X) spectroscopic methods. A partial decay scheme of 229...中国科学院八五重大项目,国家自然科学基

~（229）Ra的衰变纲图

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 国家自然科学基金,中国科学院八五重大项

重丰中子新同位素——~(238)Th

利用兰州重离子加速器（ＨＩＲＦＬ）提供的６０ＭｅＶ／ｕ的１８Ｏ离子束照射天然铀靶，通过多核子转移反应生成２３８Ｔｈ．用快速放射化学分离技术从铀及其反应产物的混合物中分离出Ｔｈ同位素．使用两台高纯锗（ＨＰＧｅ）探测器测量了样品的γ射线活性，观测到了２３８Ｔｈ的β－衰变子体２３８Ｐａ的γ射线的生长、衰变行为，测定２３８Ｔｈ的半衰期为９．４±２．０ｍｉｎ．A new nuclide 238 Th has been produced via multinucleon transfer reaction by 60 MeV/u 18 O ion irradiation of natural uranium. The produced thorium was radiochemically separated from the mixture of uranium and its reaction products. The activity of thorium was measured by using a HPGe detector and a planar HPGe detector. 238 Th has been identified for the first time by measuring the growth and decay of the γ rays from its daughter nucleus 238 Pa. The half life ...国家自然科学基金,中国科学院资

新丰中子同位素:~(186)Hf

在兰州重离子加速器（ＦＤＵＬ）上，用６０ＭｅＶ／μ１８Ｏ离子轰击厚天然钨靶，通过多核子转移反应产生１８６Ｈｆ。使用放射化学分离技术从钨和反应产物混和物中分离出铪，并由ＨＰＧｅ探测器测量铪样品的活性．观测到了１８６Ｈｆ的子体１８６Ｔａ的７３７，５ｋｅＶＹ射线的增长、衰变行为，结果表明，本实验首次合成并鉴别了新丰中子同位素１８６Ｈｆ，测得它的半衰期为（２．６±１．２）ｍｉｎ。The radioactive nuclide 186Hf has been produced via multinucleon transfer reaction by 60 MeV / u 18 O ion irradiation of the natural tungsten. The radiochemical separation was performed to isolate the hafnium from tungsten and the complex mixture of the reaction products. The activity of the hafnium was measured using a HPGe detector The new neutron-rich isotope 186Hf has been identified for the first time by measuring the growth and decay of the 737.5keV - ray from its daughter 186Ta. The half-life of186H...国家自然科学基金,中国科学院资