Identification of New Isotope <SUP>238</SUP>Th

He Jianjun; Yang Weifan; Yuan Shuanggui; Ma Taotao; Li Zongwei; Xiong Bing; Xu Yanbing

Chinese Physics C> 1999, Vol. 23> Issue(11) : 1044-1048

Identification of New Isotope ²³⁸Th

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000

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Abstract：
Unreported heavy neutron-rich nuclide ²³⁸Th has been produced via a multinucleon transfer reaction by 60MeVIu ¹⁸0 ions bombardment of natural uranium.Thorium was radiochemically separated from the mixture of uranium and reaction products. ²³⁸Pa as a daughter nucleus of ²³⁸Th has been identified according to the growth and decay of ²³⁸Pa γ rays which has been observed. The half-life of ²³⁸Th was determined to be (9.4 + 2.0) min. At the same time, a new γ ray of (89.0 + 0.3) keV with T_1/2= (8.9 + 1.5)min was found in the γ spectrum gated with the K_α1, X ray of Pa and assigned to ²³⁸Th decay based on the measurements of its transition energy and the half-life.

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He Jianjun, Yang Weifan, Yuan Shuanggui, Ma Taotao, Li Zongwei, Xiong Bing and Xu Yanbing. Identification of New Isotope ²³⁸Th[J]. Chinese Physics C, 1999, 23(11): 1044-1048.

He Jianjun, Yang Weifan, Yuan Shuanggui, Ma Taotao, Li Zongwei, Xiong Bing and Xu Yanbing. Identification of New Isotope ²³⁸Th[J]. Chinese Physics C, 1999, 23(11): 1044-1048. shu

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Received: 1999-09-16
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Identification of New Isotope ²³⁸Th

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000

Received Date: 1999-09-16

Accepted Date: 1900-01-01

Available Online: 1999-11-05

Abstract:

Unreported heavy neutron-rich nuclide ²³⁸Th has been produced via a multinucleon transfer reaction by 60MeVIu ¹⁸0 ions bombardment of natural uranium.Thorium was radiochemically separated from the mixture of uranium and reaction products. ²³⁸Pa as a daughter nucleus of ²³⁸Th has been identified according to the growth and decay of ²³⁸Pa γ rays which has been observed. The half-life of ²³⁸Th was determined to be (9.4 + 2.0) min. At the same time, a new γ ray of (89.0 + 0.3) keV with T_1/2= (8.9 + 1.5)min was found in the γ spectrum gated with the K_α1, X ray of Pa and assigned to ²³⁸Th decay based on the measurements of its transition energy and the half-life.

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