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Chinese Physics C> 2005, Vol. 29> Issue(5) : 451-455 

Identification of the New Isotope 265107Bh by α Correlated Decay Chains

  •  Institute of Modern Physics,CAS,Lanzhou 730000,China2 Lan Zhou University,LanZhou 730000,China3 Department of Physics, Nanjing University,Nanjing 210008,China

  • The experimental set-up, methods and results on the synthesis and identification of the new isotope 265 107Bh are presented in this paper. The new isotope was produced by the complete fusion-evaporation reaction of 243Am with 168MeV 26Mg at the Sector Focus Cyclotron of Heavy Ion Research Facility Lanzhou. The reaction products were transported and collected using helium-jet technique and a set of rotating wheel system. The identification of the new isotope was made by observing of correlated a-particle decays chain between the new isotope 265Bh and its 261Db and 257Lr daughters. A total of 8 correlated decay events of 265Bh and 4 decay events of 264Bh were observed. The new nuclide 265Bh has a half-life of 0.94+0.70 -0.31s and decays by alpha-particle emission with decay energy of Ea=(9.24±0.05)MeV. The half-life and a decay energy of 265Bh from this experiment are consistent with theoretical predictions.
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    [1] .GAN Zai-Guo,QIN Zhi,FAN Hong-Mei et al.Eur.Phys.J.,2001,A10:21—252.GAN Zai-Guo,FAN Hong-Mei,QIN Zhi et al.High Energy Physics and Nuclear Physics,2004,28 (4):332—334 (in Chinese)(甘再国,范红梅,秦芝等.高能物理与核物理,2004,28(4):332—334)3.Münzenberg G,Hofmann S,Heβberger F P et al.Z.Phys.,1981,A300:107—1084.Wilk P A,Gregorich K E,Tüler A et al.Phys.Rev.Lett.,2000,85:26975.Oganessian Yu Ts,Utyonkoy V K,Lobanov Yu V et al.Phys.Rev.,2004,C69:0216016.GAN Zai-Guo,GUO Jun-Sheng,QIN Zhi et al.Nuclear Physics Re-view,2003,20(2):99—101 (in Chinese)(甘再国,郭俊盛,秦芝等.原子核物理评论,2003,20 (2):99 —101)7.Gregorich K E.Nucl.Instrum.Methods Phys.Res.,1991,A302:1358.Firestone R B,Shirley V S,Baglin CMet al.Table of Isotopes (Eighth Edition),New York:LBL,University of California,19969.Wapstra A H,Audi G.Nucl.Phys.,1985,A432:5510.Mê ller P,Nix J R,Kratz KL.Atom.Data Nucl.Data Tables,1997,66:13111.REN Zhong-Zhou,CHEN Ding-Han,TAI Fei et al.Phys.Rev.2003,C67:06430212.Hofmann S,Hessberger F P,Ackermann D et al.Eur.Phys.J.,2002,A14:147

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FAN Hong-Mei, WU Xiao-Lei, GUO Jun-Shen, GAN Zai-Guo, QIN Zhi, LEI Xiang-Guo, DONG Cheng-Fu, XU Hua-Gen, CHEN Ruo-Fu, ZHANG Fu-Ming, GUO Bin, LIU Hong-Ye, WANG Hua-Lei, Identification of the New Isotope 265107Bh by α Correlated Decay Chains[J]. Chinese Physics C, 2005, 29(5): 451-455.
FAN Hong-Mei, WU Xiao-Lei, GUO Jun-Shen, GAN Zai-Guo, QIN Zhi, LEI Xiang-Guo, DONG Cheng-Fu, XU Hua-Gen, CHEN Ruo-Fu, ZHANG Fu-Ming, GUO Bin, LIU Hong-Ye, WANG Hua-Lei, Identification of the New Isotope 265107Bh by α Correlated Decay Chains[J]. Chinese Physics C, 2005, 29(5): 451-455. shu
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Received: 2004-10-29
Revised: 1900-01-01
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Identification of the New Isotope 265107Bh by α Correlated Decay Chains

    Corresponding author: FAN Hong-Mei,
  • Institute of Modern Physics,CAS,Lanzhou 730000,China2 Lan Zhou University,LanZhou 730000,China3 Department of Physics, Nanjing University,Nanjing 210008,China
  • Received Date: 2004-10-29
  • Accepted Date: 1900-01-01
  • Available Online: 2005-05-05

Abstract: The experimental set-up, methods and results on the synthesis and identification of the new isotope 265 107Bh are presented in this paper. The new isotope was produced by the complete fusion-evaporation reaction of 243Am with 168MeV 26Mg at the Sector Focus Cyclotron of Heavy Ion Research Facility Lanzhou. The reaction products were transported and collected using helium-jet technique and a set of rotating wheel system. The identification of the new isotope was made by observing of correlated a-particle decays chain between the new isotope 265Bh and its 261Db and 257Lr daughters. A total of 8 correlated decay events of 265Bh and 4 decay events of 264Bh were observed. The new nuclide 265Bh has a half-life of 0.94+0.70 -0.31s and decays by alpha-particle emission with decay energy of Ea=(9.24±0.05)MeV. The half-life and a decay energy of 265Bh from this experiment are consistent with theoretical predictions.

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