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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

  • 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(T1/2=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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    [1] . Fedoseyev V N, Jading Y, Josson O C et al. Z. Phys., 1995, A353: 9—112. Mishin VI, Fedoseyev V N, Kluge H J et al. Nucl. Instr. And Meth., 1993, B73: 550—560 3. ZHAO Zhi-Zheng. Nucl. Phys. Rew., 1998, 15: 10—14(in Chinese)(赵之正. 原子核物理评论, 1998, 15: 10—14)4. ZHAO Zhi-Zheng, YANG Yong-Feng, WANG Tong-Qing et al. HEP NP. 2001, 25(11): 1106(in Chinese)(赵之正, 杨永峰, 王同庆等. 高能物理与核物理, 2001, 25(11): 1106)5. ZHENG Zhao-Miao, ZHAO Zhi-Zheng, YANG Yong-Feng et al. Nucl. Tech. 1999, 22(1): 37—41(in Chinese)(郑兆妙, 赵之正, 杨永峰等. 核技术, 1999, 22(1): 37—41)6. ZHAO Zhi-Zheng, YANG Yong-Feng, ZHENG Zhao-Miao et al. HEP NP. 1998, 22(9): 844—852(in Chinese)(赵之正, 杨永峰, 郑兆妙等. 高能物理与核物理, 1998, 22(9): 844—852)

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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.
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. shu
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Received: 2001-02-28
Revised: 1900-01-01
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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/u 18O+natTa→167Yb(T1/2=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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