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Chinese Physics C> 1993, Vol. 17> Issue(10) : 959-960 

The Synthesis and Identification of New Neutron-Rich Heavy Nuclide 237Th

  •  Institute of Modern Physics,Academia Sinica,Lanzhou 730000

  • New neutron-rich heavy isotope 237Th was produced in the 238U(n,2p)237Th reaction by 14MeV neutron irradiation of (NH4)2U2O7 powder and separated by radiochemical methods.The new activity was first identified by following the time sequence spectra of the γ-rays of its daughter 237pa.A radioactive series decay analyzing program was applied resulting in the halflife of 5.0±0.9min for 237Th.In addition,a new 35.1±0.3keV γ-ray with T1/2=5.0±1.1min was found and assigned to 237Th.
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    [1] Yuan Shuanggui,Zhang Tianmei. Pan Qiangyan,Zhang Xueqian, Xu Shuwei,Z. Phys. ,A344(1993),355.[2]Du Yifei,Jiao Dunpang,Yin Xijin,IMP Annual Report, (1990),123.[3]Y. A. ELLIS-AKOVALI, Nuclear Data Sheets,49(1986),181[4]A. Staudt E. Hender,K. Muto,H. V. Klapdor-Ieingrothaus,Atomic Data and Nuclear Data Tables,44(1990),79.

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YUAN Shuang-Gui, ZHANG Tian-Mei, XU Shu-Wei, LI Zong-Wei, PAN Qiang-Yan, ZHAO Zhi-Zheng, YANG Wei-Fan, ZHANG Xue-Qian, LI Wei-Sheng, YIN Xi-Jin, DU Yi-Fei and WANG Yi-Hao. The Synthesis and Identification of New Neutron-Rich Heavy Nuclide 237Th[J]. Chinese Physics C, 1993, 17(10): 959-960.
YUAN Shuang-Gui, ZHANG Tian-Mei, XU Shu-Wei, LI Zong-Wei, PAN Qiang-Yan, ZHAO Zhi-Zheng, YANG Wei-Fan, ZHANG Xue-Qian, LI Wei-Sheng, YIN Xi-Jin, DU Yi-Fei and WANG Yi-Hao. The Synthesis and Identification of New Neutron-Rich Heavy Nuclide 237Th[J]. Chinese Physics C, 1993, 17(10): 959-960. shu
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Received: 1900-01-01
Revised: 1900-01-01
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The Synthesis and Identification of New Neutron-Rich Heavy Nuclide 237Th

    Corresponding author: YUAN Shuang-Gui,
  • Institute of Modern Physics,Academia Sinica,Lanzhou 730000
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1993-10-05

Abstract: New neutron-rich heavy isotope 237Th was produced in the 238U(n,2p)237Th reaction by 14MeV neutron irradiation of (NH4)2U2O7 powder and separated by radiochemical methods.The new activity was first identified by following the time sequence spectra of the γ-rays of its daughter 237pa.A radioactive series decay analyzing program was applied resulting in the halflife of 5.0±0.9min for 237Th.In addition,a new 35.1±0.3keV γ-ray with T1/2=5.0±1.1min was found and assigned to 237Th.

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