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

A New Heavy Neutron-rich Isotope²³⁸Th

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.

References

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Yuan Shuanggui et al. Z Phys, 1993, A346: 187—188 2 Yuan Shuanggui et al.High Energy Physics and Nuclear Physics(in Chinese),1993,17:959—960(袁双贵等.高能物理与核物理,1993,17:959–960) 3 Zhang Li et al. Phys. Rev, 1994, C49:592–593 4 Zhang Li et al. High Energy Physics and Nuclear Physics(in Chinese),1992, 16:767—768(张立等.高能物理与核物理,1992,16:767—768) 5 Yuan Shuanggui et al. Z Phys, 1995, A352:235–2366 Yang Weifan et al. High Energy Physics and Nuclear Physics(in Chinese), 1995, 19:479–480(杨维凡等.高能物理与核物理,1995,19:479–480)7 Yuan Shuanggui et al. Phys. Rev、 1998, C57:1506– 1507 8 Yang Weifan et al.High Energy Physics and Nuclear Physics(in Chinese), 1997, 21:958–959(杨维凡等.高能物理与核物理,1997,21:958—959) 9 Staudt A Bender B, klapolor–kleingronthaus H V At Data Nucl. Data Tables,1990, 44:7910 Firestone Richard B. Table of Isotopes,1996, 2:2780

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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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沈阳化工大学材料科学与工程学院沈阳 110142

A New Heavy Neutron-rich Isotope²³⁸Th

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 nuclide²³⁸Th has been produced via multinucleon transfer reaction induced by 60MeV/u¹⁸O 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. The²³⁸Th has been identified for the first time by measuring the growth and decay of the γ-rays from its daughter²³⁸Pa. 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 to²³⁸Th decay based on the measurement of transition energy and half life.