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

The Synthesis and Identification of New Neutron-Rich Heavy Nuclide²³⁷Th

Institute of Modern Physics,Academia Sinica,Lanzhou 730000

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Abstract：
New neutron-rich heavy isotope ²³⁷Th was produced in the ²³⁸U(n,2p) ²³⁷Th reaction by 14MeV neutron irradiation of (NH ₄) ₂U ₂O ₇powder 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 T _1/2=5.0±1.1min was found and assigned to ²³⁷Th.

References

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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.

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Received: 1900-01-01
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

The Synthesis and Identification of New Neutron-Rich Heavy Nuclide²³⁷Th

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 isotope²³⁷Th was produced in the²³⁸U(n,2p)²³⁷Th reaction by 14MeV neutron irradiation of (NH₄)₂U₂O₇powder and separated by radiochemical methods.The new activity was first identified by following the time sequence spectra of the γ-rays of its daughter²³⁷pa.A radioactive series decay analyzing program was applied resulting in the halflife of 5.0±0.9min for²³⁷Th.In addition,a new 35.1±0.3keV γ-ray with T_1/2=5.0±1.1min was found and assigned to²³⁷Th.