Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample

Zhang Li; Wang Jicheng; Zhao Jinhua; Yang Yongfeng; Zheng Jiwen; Qin Zhi; Zhang Chun; Guo Tianrui

Chinese Physics C> 1997, Vol. 21> Issue(10) : 891-896

Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample

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

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Abstract：
A new detection system was constructed by means of combination of a coincidence and an anticoincidence. The γ-ray energy signals detected by a HPGe detector were in coincidence with energy-loss signals of β rays detected by a 4πΔEβ detector, then the coincidence output were in anticoincidence with the positron-annihilating 511 keV γ signals detected by a large BGO detector. This system may reduces the Compote background for γ-spectrum measurement by about one order of magnitude. With strong suppression to the detection of the decaying γ rays from neutron-deficient isotopes, the detection of the decaying γ rays from neutron-rich isotopes can keep a higher efficiency of (46±3)% compared to single-spectrum measurement. This system was used for determining the half-life of the neutron-rich isotope ²⁰⁸Hg. A new value of 41.5_-4.1 ^+5.0min was obtained, which is in agreement with the earlier value obtained by radiochemical milking method, but the measurement error was substantially improved.

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Zhang Li, Wang Jicheng, Zhao Jinhua, Yang Yongfeng, Zheng Jiwen, Qin Zhi, Zhang Chun and Guo Tianrui. Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample[J]. Chinese Physics C, 1997, 21(10): 891-896.

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Received: 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

Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample

Corresponding author: Zhang Li,

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

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1997-10-05

Abstract: A new detection system was constructed by means of combination of a coincidence and an anticoincidence. The γ-ray energy signals detected by a HPGe detector were in coincidence with energy-loss signals of β rays detected by a 4πΔEβ detector, then the coincidence output were in anticoincidence with the positron-annihilating 511 keV γ signals detected by a large BGO detector. This system may reduces the Compote background for γ-spectrum measurement by about one order of magnitude. With strong suppression to the detection of the decaying γ rays from neutron-deficient isotopes, the detection of the decaying γ rays from neutron-rich isotopes can keep a higher efficiency of (46±3)% compared to single-spectrum measurement. This system was used for determining the half-life of the neutron-rich isotope ²⁰⁸Hg. A new value of 41.5_-4.1 ^+5.0min was obtained, which is in agreement with the earlier value obtained by radiochemical milking method, but the measurement error was substantially improved.

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Detection of Weak γ-Activities of Neutron-Rich Isotopesin Element-Separated Sample

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