A New Heavy Neutron-rich Isotope 238Th |
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| Authors: | Xu Yanbing Yuan Shuanggui Yang Weifan He Jianjun Li Zongwei Ma Taotao Xiong Bing Qin Zhi Mou Wantong Gan Zaiguo Shi Lijun Guo Tianrui Chen Zhantu Guo Junsheng |
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| Institution: | Institute of Modern Physics. The Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | A new nuclide 238Th has been produced via multinucleon transfer reaction induced by 60MeV/u 18O ion irradiation of natural uranium. The 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. The 238Th has been identified for the first time by measuring the growth and decay of the γ-rays from its daughter 238Pa. The half-life of 238Th was determined to be (9.4±2.0)min. In addition,a new (89.0±0.3)keV γ-ray with T1/2=(8.9±1.5)min was observed and assigned to 238Th decay based on the measurement of transition energy and half life. |
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