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Properties of the 3/2.-[52.] band in the odd-N rare-earth nuclei

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Science china(physics,Mechanics & Astronomy) 2011年第S1期54卷 37-43页

作者： CHEN Liang1,2. ZHOU XiaoHong1,2. ZHANG YuHu1, ZHANG ShuangQuan3 & ZHU LiHua4 1institute of Modern physics, Chinese Academy of Sciences, Lanzhou 730000,{2. 2.raduate University of Chinese Academy of Sciences, beijing 100049,{2. 3State Key Laboratory of nuclear physics and Technology, School of physics, Peking University, beijing 100871,{2. 4china institute of {12. energy, beijing 102413,{2. 1. institute of Modern physics Chinese Academy of Sciences Lanzhou 730000 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China4. China Institute of Atomic Energy Beijing 102413 China

High-spin states in 161Er have been studied experimentally via the 150Nd(16O, 5n) reaction at a beam energy of 86 MeV. Three rotational bands built on the 5/2.[642., 3/2.[52.], and 11/2.[505] configurations have been extended up to high-spin states, and particularly, the α = -1/2.branch of the ground state 3/2.[52.] band has been revised significantly. It is found that signature inversion occurs in the 3/2.[52.] band after the band crossing in 161Er. The systematics of the signature inversion associated with the 3/2.[52.] configuration in the rare-earth region is discussed. The band properties are analyzed within the framework of a triaxial particle-rotor model, and a triaxial deformation is proposed to the 3/2.[52.] band.

关键词： high-spin states signature inversion triaxial particle-rotor model

Brownian ratchets driven by flashing noise strength

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Chinese Science Bulletin 1999年第21期44卷 1956-1961页

作者： ZHAO Tongjun, ZHAN Yong, ZHUO Yizhong and WU Xizhendepartment of Applied Mathematics and physics , Hebei University of Technology , Tianjin 300130,{2. china institute of atomic energy, beijing 102413,{2. institute of Theoretical physics, Chinese Academy of Sciences , beijing 100080,{2. Corresponding author Dept. of Appl. Math. and physics Hebei University of Technology Tianjin 300130 China china institute of {2. energy Beijing 102413 China institute of Theoretical physics Chinese Academy of Sciences Beijing 100080 China

The stochastic transport driven by flashing multi-noise sources in a ratchet is studied. The stationary current versus the noise strength and the colored noise correlated time T is obtained . At a fixed flip rate and strength of the colored noises, the novel phenomenon of the current reversal occurs as T reaches a certain value. More than one reversal point exists when

关键词： flashing force ratchet current reversal Langevian equation.

Influence of some factors on alpha energy spectrum of^(2.1)Am fire alarm source

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nuclear Science and Techniques 1999年第1期10卷 11-13页

作者： FENG Gensheng FENG Xinzhan LI Shujuan (china institute of {2. energy, beijing 102413) china institute of {2. energy Beijing 102413 China

Several primary factors influencing the alpha energy spectrum of 2.1Am fire alarm source have been studied in order to get better alpha energy spectrum. The results show that the homogeneity and the thickness of metal surface coat and the size of active area of the source have considerable influence on the alpha energy spectrum of the source.

关键词：火警 2.1Am警报源 α-能谱

Heavy ion reactions around the Coulomb barrier

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中国科学：物理学、力学、天文学英文版 2011年第S1期54卷 6-13页

作者： ZHANG HuanQiao1, LIN ChengJian1, JIA HuiMing1, ZHANG ChunLei1,2. ZHANG GaoLong1,3, YANG Feng1, LIU ZuHua1, AN GuangPeng1, WU ZhenDong1, XU XinXing1 & JIA Fei1 1 china institute of atomic energy, P. O. Box 2.5(10), beijing 102413,{2. 2.Particle Astrophysics Center, institute of High energy physics, Chinese Academy of Sciences, beijing 100039,{2. 3 School of physics and nuclear energy Engineering, Beihang University, beijing 100191,{2. 1. china institute of atomic energy P. O. Box 275(10) Beijing 102413 China2. Particle Astrophysics Center Institute of High Energy Physics Chinese Academy of Sciences Beijing 100039 China3. School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China

The angular distributions of fission fragments for the 32.+184W reaction near Coulomb barrier energies are measured. The ex perimental fission excitation function is obtained. The measured fission cross sections are decomposed into fusion-fission, quasi-fission and fast fission contributions by the dinuclear system (DNS) model. The hindrance to completing fusion both at small and large collision energies is explained. The fusion excitation functions of 32.+90,96Zr in an energy range from above to below the Coulomb barrier are measured and analyzed within a semi-classical model. The obvious effect of positive Q-value multi-neutron transfers on the sub-barrier fusion enhancement is observed in the 32.+96Zr system. In addition, the excitation functions of quasi-elastic scattering at a backward angle have been measured with high precision for the systems of 16O+2.8Pb, 196Pt, 184W, and 154,152.m at energies well below the Coulomb barrier. Considering the deformed coupling effects, the extracted diffuseness parameters are close to the values extracted from the systematic analysis of elastic and inelastic scattering data. The elastic scattering angular distribution of 17F+12. at 60 MeV is measured and calculated by using the continuum-discretized coupled-channels (CDCC) approach. It is found that the diffuseness parameter of the real part of core-target potential has to be increased by 2.% to reproduce the experimental result, which corresponds to an increment of potential depth at the surface re gion. The breakup cross section and the coupling between breakup and elastic scattering are small.

关键词： fusion-fission quasi-fission fusion hindrance fusion enhancement surface diffuseness parameter exotic nuclei

Further research on high-spin structure in ^(161)Lu

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Science china(physics,Mechanics & Astronomy) 2008年第3期51卷 315-320页

作者： LI YanXia1,2.YU ShaoYing1,2.4,SHEN CaiWan1,5,LI XiaoWei6 & CHEN YongShou3,4 1 School of Science,Huzhou Teachers College,Huzhou 313000,china 2.College of Mathematics,physics and Information Engineering,Zhejiang Normal University,Jinhua 32.000,china 3 china institute of atomic energy,beijing 102413,china 4 institute of Theoretical physics,Chinese Academy of Sciences,beijing 100080,china 5 Center of Theoretical nuclear physics,National Laboratory of Heavy Ion Accelerator of Lanzhou,Lanzhou 730000,china 6 department of physics,Chifeng University,Chifeng 02.001,china School of Science Huzhou Teachers College Huzhou 313000 China College of Mathematics Physics Information Engineering Zhejiang Normal University Jinhua 321000 China china institute of {2. energy Beijing 102413 China institute of Theoretical physics Chinese Academy of Sciences Beijing 100080 China Center of Theoretical nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China department of physics Chifeng University Chifeng 024001 China

The two-dimensional total routhian surface (TRS) calculations were performed to probe into the triaxial superdeformed characteristics of a strongly populated band X2.in 161Lu. This band was identified as a triaxial superdeformed band by using our TRS method. We also got its formation mechanics,i.e. the neutron-shell correction energy plays a crucial role,while the rotating energy and the deformation-driving effect of high j intruder orbit i13/2.also play an additional role.

关键词： TRS method triaxial superdeformation formation mechanism

Catalytic protection of stannous ion by ascorbic acid in diphosphonic acids solutions

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nuclear Science and Techniques 1998年第2期9卷 121-123页

作者： Liu Guo-Zheng Liu Fei Miao Zeng-Xing Wang Yi-Shan and Fang Ji-Dong (Isotope department, china institute of atomic energy,{2.) Isotope department China Institute of Atomic Energy Beijing 102413 China

The protective ability of ascorbic acid(Vc) on stannous ion and the influence of light irradiation on the stability of stannous ion in diphosphonate medium at pH=5 have been examined in order to attain minimal loss of stannous ion during the production of lyophilized radiopharmaceutical *** sum of stanous ion and Vc was determined with iodometric *** was shown that the protective ability of Vc was still strong at Vc concentration much lower than that of stannous ion and the illumination by fluorescent lamp was unfavorable to the stability of stannous *** change of pH in the range 3-9 did not affect the action of Vc significantly.

关键词：锡离子稳定性骨造影工具

Approximation analytical solutions for a unified plasma sheath model by double decomposition method

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nuclear Science and Techniques 1998年第4期9卷 193-197页

作者： Fang Jin-Qing (china institute of {2. energy beijing 102413)

A anified plasma sheath model and its potential equation are proposed. Any higher-ordor-approximation analytical solutions for the unified plasma sheath potential equa tiop are derived by double decomposition method.

关键词：等离子体屏蔽模型双分解方法近似分析

Calculation of triaxial superdeformation in ^(174)Hf

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Science china(physics,Mechanics & Astronomy) 2007年第5期50卷 553-557页

作者： YU ShaoYing1,2.4, LI XiaoWei2. SHEN CaiWan1,5 & CHEN YongShou3,4 1 School of Science, Huzhou Teachers College, Huzhou 313000, china 2.College of Mathematics, physics and Information Engineering, Zhejiang Normal University, Jinhua 32.000, china 3 china institute of atomic energy, beijing 102413, china 4 institute of Theoretical physics, Chinese Academy of Sciences, beijing 100080, china 5 Center of Theoretical nuclear physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, china 1. School of Science Huzhou Teachers College Huzhou 313000 China 2. College of Mathematics Physics and Information Engineering Zhejiang Normal University Jinhua 321000 China 4. institute of Theoretical physics Chinese Academy of Sciences Beijing 100080 China 5. Center of Theoretical nuclear physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 China 3. china institute of atomic energy Beijing 102413 China

A two-dimensional Total Routhian Surface (TRS) calculation with the fixed hexa- decapole deformation ε4 = 0.03 was carried out for several configurations of 174Hf. Results indicate that the shell corrections have an important contribution to the formation of triaxial superdeformation in 174Hf and some possible configuration assignments are made to the 4 TSD bands experimentally found in 174Hf.

关键词： Total Routhian Surface (TRS), triaxial superdeformation, configuration

Integrated Numerical Experiment of an Intense RF Linac for CIAE Far-Infrared FEL

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Chinese journal of nuclear physics 1997年第2期19卷 121-127页

作者： Fu Shinian Chen Yinbao Huang Zhibin china institute of atomic energy,P.O.Box 2.5(17),beijing {2. 中国原子能科学院北京

An L band RF linac is now under installation at CIAE to provide intense electronbeam for a far-infrared free-electron laser *** linac consists of a DC thermionicgun,a subharmonic prebuncher,a buncher,an accelerating section and a beam transport *** the INEX(Integrated Numerical Experiment)conducted for prediction of the perfor-mance of the complex and the comparison of some of the simulation results with available ex-perimental data,it shows that the beam quality can satisfy our FEL requirements.

关键词： RF linac Free electron laser Integrated numerical experiments