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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

  • 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 T1/2= (8.9 + 1.5)min was found in the γ spectrum gated with the Kα1, 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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    [1] Rohozinski S G. Rep. Prog. Phys., 1989, 51:5412 Berlovich E Y et al. Phys. Lett., 1969, B29: 1553 Yang Chengzhong. Chinese Jour Trends in Nucl. Phys., 1985, 1:14 Loveland W et al. Nucl. Phys., 1987, A471 (1,2): 175c5 Daniel Guerreau et al. Nucl. Phys., 1986, A447:37c6 Mcgaughey P L et al. Phys. Rev., 1985, C31(3):8967 Zhang Li et al. Phys. Rev., 1994, C49(2): 5928 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)9 Yuan Shuanggui et al. Z. Phys., 1995, A352(3):23510 Yang Weifan et al. High Energy Physics and Nuclear Physics (in Chinese), 1995, 19:479-480(杨维凡等, 高能理物理与核物理，1995,19: 479-480)11 Yuan Shuanggui et al. Phys. Rev., 1998, C57: 1506-150712 He Jianjun et al. High Energy Physics and Nuclear Physics (in Chnese), 1997, 21:958-959(杨维凡等, 高能理物理与核物理,1997， 21: 958-959)13 Zhang Li et al. Eur. Phys. J., 1998, A2:514 Richard B Hrestone. Table of Isotopes, 8th Edition, 1996, 2:278015 Staudt A et al. At Data and Nucl. Data Tables, 1990, 44:7916 Klapdor H V et al. At. Data Nucl. Data Tables, 1984, 31: 8117 Takayoshi Horiguchi et al. Chart of the Nuclides 1996

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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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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 T1/2= (8.9 + 1.5)min was found in the γ spectrum gated with the Kα1, 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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