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A High-Spin Isomer in ^(198)Bi

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Chinese Physics Letters 1996年第8期13卷 576-578页

作者： ZHOU Xiao-hong SUN xiang-fu guo ying-xiang LEI xiang-guo CHEN Xin-feng LIU Zhong ZHANG Yu-hu JIN Han-juan LUO Yi-xiao WEN Shu-xian YUAN Guan-jun LI Guang-sheng YANG Chun-xiang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China Institute of Atomic Energy Beijing 102413

High-spin states in ^(198)Bi were populated via the ^(187)Re(^(16)O,5n)reaction.A partial level scheme for ^(198)Bi was established for the first time,including a 15^(+)high-spin isomeric state with a measured half-life of 8.0±*** comparing the level structure of ^(198)Bi with that of the even-even core ^(198)Pb,the configuration v(i_(13/2))^(-2) v(P_(3/2))^(-1)π(h_(9/2))^(1) was ascribed to this isomeric state.

关键词： reaction state

New Isomeric States in ^(197)Bi

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Chinese Physics Letters 1996年第1期13卷 13-16页

作者： ZHOU Xiao-hong SUN xiang-fu guo ying-xiang LEI xiang-guo CHEN Xin-feng LIU Zhong ZHANG Yu-hu JIN Han-juan LUO Yi-xiao WEN Shu-xian YUAN Guan-jun LI Guang-sheng YANG Chun-xiang Institute of Modern Physics Academia SinicaLanzhou 730000 China Institute of Atomic Energy Beijing 102413

The high-spin states in ^(197)Bi have been studied with the ^(187)Re(^(16)O,6n)reaction at ^(16)O energies from 85 to ***-beam measurements of γ-ray excitation functions,γ-γ-t coincidences and γ-ray angular distributions were carried out with six BGO(AC)HPGe detectors and one intrinsic Ge planar *** new tram sitions and three new isomers were observed,and a level scheme for ^(197)Bi was *** differences between the present work and the previous results were found.

关键词： detector isomers

Evidence for Octupole Correlations in ^(117)Xe

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Chinese Physics Letters 1996年第11期13卷 805-808页

作者： LIU Zhong SUN xiang-fu ZHOU Xiao-hong LEI xiang-guo guo ying-xiang JIN Han-juan ZHANG Yu-hu CHEN Xin-feng LUO Yi-xiao WEN Shu-xian YANG Chun-xiang YUAN Guan-jun LI Guang-sheng LIU xiang-an Chen Yong-shou Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China Institute of Atomic Energy Beijing 102413

High spin states in neutron-deficient ^(117)Xe have been studied by using in-beamγspectroscopy method.A new positive-parity rotational band has been *** decays into the yrast vh_(11/2 )band via five electric dipole *** magnitudes of these E1 transitions are extracted and they are much enhanced compared to the normal E1 *** is taken as an evidence for octupole correlations in ^(117)Xe.

关键词： method transitions

Nonlinear dynamics of angle-ply composite laminated thin plate with third-order shear deformation

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Science China(Technological Sciences) 2010年第3期53卷 612-622页

作者： guo xiang ying,ZHANG Wei & YAO MingHui College of Mechanical Engineering,Beijing University of Technology,Beijing 100124,China College of Mechanical Engineering Beijing University of Technology Beijing China

An asymptotic perturbation method is presented based on the Fourier expansion and temporal rescaling to investigate the nonlinear oscillations and chaotic dynamics of a simply supported angle-ply composite laminated rectangular thin plate with parametric and external *** to the Reddy's third-order plate theory,the governing equations of motion for the angle-ply composite laminated rectangular thin plate are derived by using the Hamilton's ***,the Galerkin procedure is applied to the partial differential governing equation to obtain a two-degrees-of-freedom nonlinear system including the quadratic and cubic nonlinear *** equations are utilized to deal with the resonant case of 1:1 internal resonance and primary parametric resonance-1/2 subharmonic ***,the stability analysis is given for the steady-state solutions of the averaged *** on the averaged equation obtained by the asymptotic perturbation method,the phase portrait and power spectrum are used to analyze the multi-pulse chaotic motions of the angle-ply composite laminated rectangular thin *** certain conditions the various chaotic motions of the angle-ply composite laminated rectangular thin plate are found.

关键词： angle-ply composite laminated plate third-order shear deformation theory parametric excitation chaotic motion

Properties of theβDelayed Proton Decay of 147Er

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Chinese Physics Letters 2010年第6期27卷 59-61页

作者： MA Fei ZHOU Xiao-Hong ZHENG Yong XU Shu-Wei XIE Yuan-xiang CHEN Liang ZHANG Yu-Hu LI Zhan-Kui QIANG Yun-Hua LEI xiang-guo guo ying-xiang guo Song DING Bing WANG Hai-Xia LI Guang-Shun ZHOU Hou-Bing Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Graduate University of Chinese Academy of Sciences Beijing 100049

The β-delayed proton decay of 147Er is studied experimentally using the 58 Ni＋92Mo reaction at a beam energy of 383 MeV. Based on a He-jet apparatus coupled with a tape transport system, the β-delayed proton radioactivities both from the vδl/2 ground state and the vh11/2 isomer in 147 Er are identified by proton-7 coincidence measurements. By analyzing the time distribution of the 4＋ → 2＋-γ transition in the grand-daughter nucleus 146Dy, a half-life of 1.6 ± 0.2s is determined for the Vh11/2 isomer in 147 Er. The half-life for the ground state of 147Er is estimated to be 3.2±1.2 s.

关键词： Tapes Transport Measurement

Signature Inversion in Odd-odd Nuclei

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原子核物理评论 2009年第S1期26卷 158-164页

作者： LIU Min-liang,ZHANG Yu-hu,ZHOU Xiao-hong,guo ying-xiang,LEI xiang-guo,guo Wen-tao(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China) Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

Signature inversion in odd-odd nuclei is investigated by using a proton and a neutron coupling to the coherent state of the core. Two parameters are employed in the Hamiltonian to set the energy scales of rotation,neutron-proton coupling and their competition. Typical level staggering is extracted from the calculated level energies. The calculation can approximately reproduce experimental signature inversion. Signature inversion is attributed to the rotational motion and neutron-proton residual interaction having reversed signature splitting rules. It is found signature inversion can appear at axially symmetric shape and high-K band.

关键词： signature odd-odd nuclei neutron-proton interaction

(EC+β^(+)) Decay of ^(128)Ce

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Chinese Physics Letters 2000年第11期17卷 787-788页

作者： LI Zhan-Kui XU Shu-Wei XIE Yuan-xiang ZHANG Tian-Mei MA Rui-Chang guo ying-xiang GE Yuan-Xiu WANG Chun-Fang guo Bin XING Jian-Ping DU Jin-Zhou Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 Department of Modern Physics Lanzhou UniversityLanzhou 730000

The (EC+β^(+)) decay of ^(128)Ce was reinvestigated in the^(116)Sn (l6O, 4n) reaction by using a helium-jet tape transport system. The decay γ rays of ^(128)Ce were unambiguously described from those of ^(129)Ce after taking the comparing experiments of ^(16)O+^(116)Sn and ^(16)O+^(117)Sn. Based on x-γ and γ-γ coincidence measurements, a detailed (EC+β^(+)) decay scheme of ^(128)Ce has been proposed which modifies the previous one, and takes accounts of 100 observed γ-lines.

关键词： decay coincidence

Half-Lives of Low-Lying Isomeric States in ^(169)Ta

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Chinese Physics Letters 1998年第2期15卷 92-94页

作者： ZHANG Yu-hu ZHAO Qing-zhong ZHU Shao-fei XU Hu-shan ZHOU Xiao-hong guo ying-xiang LEI xiang-guo LU Jun GOU Quan-bu LIU Zhong JIN Han-juan LUO Yi-xiao SUN xiang-fu ZHU Yong-tai Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000

Two low-lying isomeric states in 169Ta have been identified via ^(159)Tb(l6O,6nγ)^(169)Ta *** half-lives are measured to be 28±5ns for the 9/2^(-)level and 17±4 ns for the 5/2^(-)level by using the delayedγ-γcoincidence *** two isomeric states are considered to be the bandheads with 9/2-[514]and 1/2-[541]configurations,*** neutron quasiparticle configuration for the ground state of ^(169)W is discussed.

关键词： reaction. method.

Experimental Study on High-Spin States in ^(119)Xe

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Chinese Physics Letters 2000年第7期17卷 483-484页

作者： HUANG Wen-xue guo ying-xiang SUN xiang-Fu LEI xiang-guo ZHOU Xiao-Hong LIU Zhong ZHANG Yu-Hu ZHU Shao-Fei XU Xiac FENG Xi-Chen LIUMing-Yi LUO Yi-Xiao WEN Shu-Xian WU xiao-Guang YUAN Guan-Jun LI Guang-Sheng YANG Chun-xiang Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China Institute of Atomic Energy Beijing 102413

High-spin states of^(119)Xe have been investigated by in-beam γ-ray spectroscopy via the reaction of ^(16)O bombarding a ^(106)Cd target at beam energies of 67-80MeV. No enhanced E1 transition was observed, the non-e... 详细信息

关键词： beam transition