Chinese Physics C > 2002, Vol. 26 > Issue(2): 134-140

Results of the First On-line Experiment of the Laser Ion Source

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China1 Department of Physics, Tsinghua University, Beijing 100084, China2 Department of Physics, McGill University, Canada

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Abstract：
The importance of using a laser ion source in the on-line isotope separator, the principle of laser ion source, laser technique and the structure of hot capillary laser ion source and target chamber are introduced. A high repetition frequncy copper vapor laser and three dye lasers were used. The capillary is made of Nb with inside diameter of 1.7mm and effective length of 3cm. It was heated by 50—100A direct current and temperature of 1800—2700K can be achieved. The nuclear reaction channel used in the first on-line experiment is 50MeV/u ¹⁸O+ ^natTa→ ¹⁶⁷Yb(T _1/2=17.5min). A joint operation of accelerator, on-line isotope separator and laser system has been realized. A total separation efficiency of 0.2% is obtained by comparison of the measured yield of ¹⁶⁷Yb with the calculated yield of ¹⁶⁷Yb by using production cross-section, beam intensity, collection time and the thickness of target. A element selectivity of 3.2 is deduced from the ratio of the corresponding peak areas of ¹⁶⁷Yb and ¹⁶⁷Lu in the γ spectra of laser on and laser off. A new high spin isomer with long half-life of ¹⁶⁷Yb was found. The methods that may be used to improve the efficiency of laser ion source are discussed.

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YANG Yong-Feng, ZHAO Zhi-Zheng, ZHENG Zhao-Miao, ZU Kai-Ling, WANG Xu-Dong, LIU Jun-Hui, ZHAO Xiao-Yan, WANG Tong-Qing, GUO Ying-Xiang, GUO Bin, LEI Xiang-Guo, JIN Gen-Ming, LUO Yi-Xiao, SHANG Ren-Cheng, XU Si-Da and Results of the First On-line Experiment of the Laser Ion Source[J]. Chinese Physics C, 2002, 26(2): 134-140.

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Received: 2001-02-28
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Results of the First On-line Experiment of the Laser Ion Source

Corresponding author:YANG Yong-Feng,

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China1 Department of Physics, Tsinghua University, Beijing 100084, China2 Department of Physics, McGill University, Canada

Received Date:2001-02-28

Accepted Date:1900-01-01

Available Online:2002-02-05

Abstract:The importance of using a laser ion source in the on-line isotope separator, the principle of laser ion source, laser technique and the structure of hot capillary laser ion source and target chamber are introduced. A high repetition frequncy copper vapor laser and three dye lasers were used. The capillary is made of Nb with inside diameter of 1.7mm and effective length of 3cm. It was heated by 50—100A direct current and temperature of 1800—2700K can be achieved. The nuclear reaction channel used in the first on-line experiment is 50MeV/u¹⁸O+^natTa→¹⁶⁷Yb(T_1/2=17.5min). A joint operation of accelerator, on-line isotope separator and laser system has been realized. A total separation efficiency of 0.2% is obtained by comparison of the measured yield of¹⁶⁷Yb with the calculated yield of¹⁶⁷Yb by using production cross-section, beam intensity, collection time and the thickness of target. A element selectivity of 3.2 is deduced from the ratio of the corresponding peak areas of¹⁶⁷Yb and¹⁶⁷Lu in the γ spectra of laser on and laser off. A new high spin isomer with long half-life of¹⁶⁷Yb was found. The methods that may be used to improve the efficiency of laser ion source are discussed.

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Results of the First On-line Experiment of the Laser Ion Source

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