A New Heavy Neutron-rich Isotope <SUP>238</SUP>Th

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

Chinese Physics C> 1999, Vol. 23> Issue(1) : 93-95

A New Heavy Neutron-rich Isotope ²³⁸Th

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 T_1/2=(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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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 and Guo Junsheng. A New Heavy Neutron-rich Isotope ²³⁸Th[J]. Chinese Physics C, 1999, 23(1): 93-95.

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Received: 1998-08-26
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

A New Heavy Neutron-rich Isotope ²³⁸Th

Corresponding author: Xu Yanbing,

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

Received Date: 1998-08-26

Accepted Date: 1900-01-01

Available Online: 1999-01-05

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 T_1/2=(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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A New Heavy Neutron-rich Isotope ²³⁸Th