Signature Splitting and Inversion and Back Bending in Negative Sideband in <SUP>80</SUP>Rb

HE Chuang-Ye; WEN Shu-Xian; ZHU Li-Hua; WANG Zhi-Min; LI Guang-Sheng; MA Rui-Gang; WU Xiao-Guang; YUAN Guan-Jun; YANG Chun-Xiang; WANG Yue; ZHANG Zhen-Long; MENG Rui

Chinese Physics C> 2003, Vol. 27> Issue(9) : 784-788

Signature Splitting and Inversion and Back Bending in Negative Sideband in ⁸⁰Rb

China Institute of Atomic Energy, Beijing 102413,China2 Department of Physics, Jinlin University, Changchun 130023,China3 Department of Physics, Tsinghua University, Beijing 100084,China4 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan

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Abstract：
High spin states of ⁸⁰Rb have been studied by using fusion evaporation reactions,⁶⁵Cu+¹⁹F,⁶⁶Zn+¹⁸O and ⁶⁸Zn+¹⁶O with beam energies of 75MeV, 76MeV and 80MeV, respectively, at HI-13 Tandem accelerator Beijing and JAERI Japan. γ-γ coincidence and DCO ratios were measured by the HPGe detector systems. About twenty new γ transitions are added to the previously proposed level schema from the present experiments. The second negative band is pushed up from 12^－ to 22^－. Abackbending at frequency of 0.49MeV is observed. Evidence has also been found for two hitherto unknown sidebands built on the negative yrast band. Signature splitting in both negative bands is observed. Signature inversion occurs only in the yrast negative band at spin of 15 and it is close to that of ⁸²Y. The plots of [E(I)-E(I-1)]/(2I) vs I are given and compared with its isotones ⁷⁸Br and ⁸²Y as well as its isotopes ⁷⁶Rb and ⁷⁸Rb.

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. Harder A ,Kabadiyski M K ,Lieb K P et al.Phys.Rev.,1995,C51(6):2932—29412. Kaye R A ,Dring J,Holcomb J W et al.Phys.Rev.,1996,C51(3):1038—10563. Landulfo E ,Winchell D F ,Saladin J X et al.Phys.Rev.,1996,C54(2):626—6374. Paul S D ,Jain H C ,Chattopadhyay S et al.Phys.Rev.,1995,C51(6):2959—29725. Tandel S K ,Patel S B ,Bhowmik R K et al.Nucl.Phys.,1998,A632:3—186. DringJ,Winter G ,Funke L et al.[J].Phys.Rev.,1992,C46:R2127

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HE Chuang-Ye, WEN Shu-Xian, ZHU Li-Hua, WANG Zhi-Min, LI Guang-Sheng, MA Rui-Gang, WU Xiao-Guang, YUAN Guan-Jun, YANG Chun-Xiang, WANG Yue, ZHANG Zhen-Long, MENG Rui, Signature Splitting and Inversion and Back Bending in Negative Sideband in ⁸⁰Rb[J]. Chinese Physics C, 2003, 27(9): 784-788.

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Received: 2002-11-28
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

Signature Splitting and Inversion and Back Bending in Negative Sideband in ⁸⁰Rb

Corresponding author: HE Chuang-Ye,

China Institute of Atomic Energy, Beijing 102413,China2 Department of Physics, Jinlin University, Changchun 130023,China3 Department of Physics, Tsinghua University, Beijing 100084,China4 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan

Received Date: 2002-11-28
Accepted Date: 1900-01-01
Available Online: 2003-09-05

Abstract: High spin states of ⁸⁰Rb have been studied by using fusion evaporation reactions,⁶⁵Cu+¹⁹F,⁶⁶Zn+¹⁸O and ⁶⁸Zn+¹⁶O with beam energies of 75MeV, 76MeV and 80MeV, respectively, at HI-13 Tandem accelerator Beijing and JAERI Japan. γ-γ coincidence and DCO ratios were measured by the HPGe detector systems. About twenty new γ transitions are added to the previously proposed level schema from the present experiments. The second negative band is pushed up from 12^－ to 22^－. Abackbending at frequency of 0.49MeV is observed. Evidence has also been found for two hitherto unknown sidebands built on the negative yrast band. Signature splitting in both negative bands is observed. Signature inversion occurs only in the yrast negative band at spin of 15 and it is close to that of ⁸²Y. The plots of [E(I)-E(I-1)]/(2I) vs I are given and compared with its isotones ⁷⁸Br and ⁸²Y as well as its isotopes ⁷⁶Rb and ⁷⁸Rb.