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双奇核172Re高自旋态实验研究

Experimental Study of High-spin States in Odd-odd 172Re

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【作者】 张玉虎王华磊周小红柳敏良M.OshimaY.TohM.KoizimiA.OsaA.KimuraY.HatsukawaT.MorikawaM.NakamuraM.SugawaraH.KusakariT.KomatsubaraK.Furuno

【Author】 ZHANG Yu-hu~(1), WANG Hua-lei~(1), ZHOU Xiao-hong~(1), LIU Min-liang~(1), M. Oshima~(2), Y. Toh~(2), M. Koizimi~(2), A. Osa~(2), A. Kimura~(2), Y. Hatsukawa~(2), T. Morikawa~(3), M. Nakamura~(3), M. Sugawara~(4), H. Kusakari~(5), T. Komatsubara~(6), K. Furuno~(6) (1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; 2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan; 3 Department of Physics, Kyushu University, Fukuoka 812-81, Japan; 4 Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan; 5 Chiba University, Inage-ku, Chiba 263-8512, Japan; 6 Institute of Physics and Tandem Accelerator Center, University of Tsukuba, Ibaraki 305-0006, Japan)

【机构】 中国科学院近代物理研究所Japan Atomic Energy Research InstituteTokaiIbaraki 319-1195JapanDepartment of PhysicsKyushu UniversityFukuoka 812-81Chiba Institute of TechnologyNarashinoChiba 275-0023Chiba UniversityInage-kuChiba 263-8512Institute of Physics and Tandem Accelerator CenterUniversity of TsukubaIbaraki 305-0006Japan 甘肃兰州730000甘肃兰州730000甘肃兰州730000

【摘要】 利用149Sm(27Al,4nγ)172Re反应布居了形变双奇核172Re的高自旋态,用12套带有BGO反康普顿抑制的高纯锗探测器阵列进行了在束γ实验测量,首次建立了172Re由3个转动带构成的高自旋态能级纲图.研究和讨论了3个转动带的结构特征,基于已有的高自旋态核结构知识并通过系统学比较和分析指出它们的准粒子组态分别为πh11/2 νi13/2,πh9/2 νi13/2和 π1/2-[541] ν1/2-[521].发现前两个转动带在自旋小于18时其转动能级呈现反常的旋称劈裂.

【Abstract】 High-spin states in the odd-odd172Re have been investigated via the149Sm(27Al, 4nγ)172Re reaction through excitation functions, X-γ and γ-γ coincidence measurements. A level scheme consisting of three rotational bands have been identified for the first time extending the high-spin studies of A≈160 odd-odd nuclei to the currently lightest rhenium isotope. The three bands have been assigned to be built on the πh11/2 νi13/2, πh9/2 νi13/2 and π1/2-\ν1/2-\ configurations according to their rotational properties in quasiparticle alignments, signature splitting, in-band B(M1)/B(E2) ratios, level spacing systematics, band crossing frequencies, as well as the existing knowledge in neighboring nuclei. Low-spin signature inversion has been confirmed in the first two bands due to observation of signature crossing at high-spin states.

【基金】 国家自然科学基金资助项目(10025525;10375077;10221003);国家重大基础研究发展规划资助项目(G2000077400);中国科学院基金资助项目~~
  • 【文献出处】 原子核物理评论 ,Nuclear Physics Review , 编辑部邮箱 ,2004年04期
  • 【分类号】O571.21
  • 【下载频次】57
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