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

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

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

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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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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.

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Received: 2004-10-29
Revised: 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

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

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