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Chinese Physics C> 2001, Vol. 25> Issue(8) : 731-735 

Measurement of β+ Delayed α Decay of 20Na

  •  Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China1 Department of Technical Physics,Peking University,Beijing 100871,China

  • Through the 20Na β+ 20Ne→16O+α process,the half-life and β+ delayed α decay spectrum of 20Na have been measured on the Radioactive Ion Beam Line in Lanzhou(RIBLL). The 20Na was identified through TOF-ΔE method and alpha particle was measured by four Si(Au) surface barrier detectors. The half life of 20 Na is(459±7)ms. Result shows that in addition to nine high excitation energy levels with Ed≥2.688MeV, three low excitation energy levels of 20Na with Ed=0.890 & 1.054,1.991,2.424 & 2.457MeV were observed in the experiment. The relative intensity for 1.991MeV level, a more important energy level in the center of mass system energy region from 1.6 to 2.5MeV obtained in this experiment is much higher than the existed one. We also obtained the relative intensities of the levels of Ed=0.890 & 1.054,2.424 & 2.457MeV.
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    [1] . DING Da-Zhao,CHEN Yong-Shou,ZHANG Huan-Qiao.Progress of Nuclear Physics,Shanghai:Scientific Technical Publishers,1997,383—466(in Chinese)(丁大钊,陈永寿,张焕乔.原子核物理进展,上海:科学技术出版社,1997,383—466)2. WU He-Yu.Nuclear Physics Rivew,1999,16(3):137—144(in Chinese)(吴和宇.原子核物理评论,1999,16(3):137—144)3. Macfarlane R D,Siivola A.Nucl.Phys.,1964,59:168—1764. Pearson J D,Almqvist E et al.Can.J.Phys.,1964,42:489—4935. Polichar R M,Steigerwalt J E et al.Phys.Rev.,1967,163:1084—10906. Torgerson D F,Wien K et al.Phys.Rev.,1973,C8:161—1677. Clifford E T H,Hagberg E et al.Nucl.Phys.,1989,A493:293—3228. Angulo C,Arnould M et al.Nucl.Phys.,1999,A656:3—1839. ZHAN Wen-Long,GUO Zhong-Yan,LIU Guan-Hua et al.Science in China,1999,A20:77—84(in Chinese)(詹文龙,郭忠言,刘冠华等.中国科学,1999,A20:77—84)10. Ajzenberg-Selove F.Nucl.Phys.,1987,A475:1—19811. Hahn K H,Chang K H et al.Phys.Rev.,1987,C36:892—898

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WANG Hong-Wei, WU He-Yu, JIN Gen-Ming, ZHANG Bao-Guo, XIAO Zhi-Gang, DUAN Li-Min, WEI Zhi-Yong, LI Zu-Yu, LU Zhao-Hui, LIU Yong-Ying, CHEN Ke-Liang, HU Rong-Jiang, ZHU Hai-Dong, CEN Ling, WANG Su-Fang, LI Xiang-Qing, CHEN Tao and HUA Hui. Measurement of β+ Delayed α Decay of 20Na[J]. Chinese Physics C, 2001, 25(8): 731-735.
WANG Hong-Wei, WU He-Yu, JIN Gen-Ming, ZHANG Bao-Guo, XIAO Zhi-Gang, DUAN Li-Min, WEI Zhi-Yong, LI Zu-Yu, LU Zhao-Hui, LIU Yong-Ying, CHEN Ke-Liang, HU Rong-Jiang, ZHU Hai-Dong, CEN Ling, WANG Su-Fang, LI Xiang-Qing, CHEN Tao and HUA Hui. Measurement of β+ Delayed α Decay of 20Na[J]. Chinese Physics C, 2001, 25(8): 731-735. shu
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Received: 2000-08-24
Revised: 1900-01-01
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Measurement of β+ Delayed α Decay of 20Na

    Corresponding author: WANG Hong-Wei,
  • Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China1 Department of Technical Physics,Peking University,Beijing 100871,China
  • Received Date: 2000-08-24
  • Accepted Date: 1900-01-01
  • Available Online: 2001-08-05

Abstract: Through the 20Na β+ 20Ne→16O+α process,the half-life and β+ delayed α decay spectrum of 20Na have been measured on the Radioactive Ion Beam Line in Lanzhou(RIBLL). The 20Na was identified through TOF-ΔE method and alpha particle was measured by four Si(Au) surface barrier detectors. The half life of 20 Na is(459±7)ms. Result shows that in addition to nine high excitation energy levels with Ed≥2.688MeV, three low excitation energy levels of 20Na with Ed=0.890 & 1.054,1.991,2.424 & 2.457MeV were observed in the experiment. The relative intensity for 1.991MeV level, a more important energy level in the center of mass system energy region from 1.6 to 2.5MeV obtained in this experiment is much higher than the existed one. We also obtained the relative intensities of the levels of Ed=0.890 & 1.054,2.424 & 2.457MeV.

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