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Synthesis of superheavy nuclei with ^(2.8)U target

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Science china(Physics,Mechanics & Astronomy) 2009年第10期52卷 1482-1488页

作者： LIU ZuHua1,3 & BAO JingDong2.4 1 Key laboratory of Beam Technology and Material Modification of Ministry of Education,Beijing Normal University,Beijing 100875,china 2.Department of Physics,Beijing Normal University,Beijing 100875,china 3 china Institute of Atomic Energy,Beijing 102.13,china 4 center of theoretical nuclear Physics,national laboratory of {12. ion Accelerator of lanzhou,lanzhou 730000,china Key laboratory of Beam Technology and Material Modification of Ministry of Education Beijing Normal University Beijing China china Institute of Atomic Energy Beijing China Department of Physics Beijing Normal University Beijing China center of theoretical {2. Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China

The production of superheavy nuclei with Z=108-116 via hot fusion reactions of the neutron-rich projectiles with 2.8U target is systematically *** results show that the production cross sections of superheavy nuclei do not decrease monotonously as the atomic number Z *** cross sections of the superheavy nuclei at Z = 112.and 115 are enhanced as compared with the whole Z-trend in synthesis of the superheavy nuclei,which clearly illustrates that the reactions with large negative Q-value and shell correction are more favorable to synthesize superheavy nuclei.

关键词： superheavy nuclei fusion reaction cross section 2.8U target

Analysis of the negative-parity yrast band in ^(155)Tb

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nuclear Science and Techniques 2000年第1期11卷 55-59页

作者： WU Xing-Ju XU Jin-Zhang CHEN Xing-Qu (center of theoretical {2. Physics, national laboratory of heavy ion Accelerator, lanzhou 730000 Physics Department,Lu-an Teacher’s College,Lu-an, Anhui 2.7012.Department of Modern Physics, lanzhou University, 六安师范专科学校重离子加速器国家实验室安徽六安 237012 兰州大学现代物理系重离子加速器国家实验室甘肃兰州 730000

Using the particle-rotor model, the energy spectrum and the B（MI）/B（E2. ratio of the negative-parity yrast band in 155Tb are investigated and compared with the experimental data before and after the band-crossing. It is noted that before and after the band-crossing the moment of inertia of the core is a smooth function of the total angular momentum I and can be described by the ah formula. The yrast band of 155Tb with negative parity may be triaxially deformed （γ=-13°） before and an axially symmetric shape （γ=0°） after the band-crossing.

关键词：铽155 原子核高自旋态结构性质负跃迁晕转态核子

Shape phase transitions in nuclei:Effective order parameters and trajectories

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Science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 88-97页

作者： ZHANG Yu1,2. HOU ZhanFeng2.& LIU YuXin2.3 1Department of Physics, Liaoning Normal University, Dalian 11602., china 2.epartment of Physics and the State Key laboratory of {2. Physics and Technology, Peking University, Beijing 100871, china 3center of theoretical {2. Physics, national laboratory of heavy ion Accelerator, lanzhou 72.000, china Department of Physics Liaoning Normal University Dalian China Department of Physics and the State Key laboratory of nuclear Physics and Technology Peking University Beijing China center of theoretical {2. Physics National Laboratory of Heavy Ion Accelerator Lanzhou China

We analyze systematically the effective order parameters in nuclear shape phase transition both in experiments and in the interacting boson model. We find that energy ratios and B(E2. ratios can distinguish the first from the second-order phase transition in theory above a certain boson number N (about 50), but in experiments, only those quantities, such as E(L1+)/E(02.) and B(E2. (L+2.1 → L1)/B(E2. 2. → 01), etc., of which the monotonous transitional behavior in the second-order phase transition is broken in the first order phase transition independent of N, are qualified as the effective order parameters. By implementing the originally proposed effective order parameters and the new ones, we find that the isotones with neutron number Nn = 62.are a trajectory of the second order phase transition. In addition, we predict that the transitional behavior of isomer shifts of Xe, Ba isotopes and Nn = 62.isotones is approximately monotonous due to the finiteness of nuclear system.

关键词： nuclear shape phase transition interacting boson model effective order parameter finite particle number effect transition trajectory

Probing proton halo of the exotic nucleus ^(2.)S by elastic electron scattering

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Science china(Physics,Mechanics & Astronomy) 2004年第1期47卷 42-51页

作者： WANG Zaijun1 & REN Zhongzhou1’2.1. Department of Physics, Nanjing University, Nanjing 2.0008, china 2. center of {2. nuclear Physics, national laboratory of heavy-ion Accelerator at lanzhou, lanzhou 730000, china Correspondence should be addressed to Ren Zhongzhou (email: zren@*** zren99@***) Received June 16, 2.03 Department of Physics Nanjing University Nanjing 210008 China center of theoretical {2. Physics National Laboratory of Heavy-Ion Accelerator at Lanzhou Lanzhou 730000 China

Elastic electron scattering on the exotic light nucleus 2.S is investigated in the plane wave Born approximation. The variation of the squared form factors of 2.S with momentum transfer is compared with that of 32.. It is found that the behavior of the form factors near the second minimum (with a moderate momentum transfer) is sensitive to the alteration of the charge density distribution of halo protons in 2.S. This indicates that elastic electron scattering can be a good probe of the structure of proton-halo nuclei.

关键词： elastic electron scattering, cross section, form factor, proton-halo nucleus.

Systematic study of survival probability of excited superheavy nuclei

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Science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 109-113页

作者： XIA ChengJun1, SUN BaoXi1, ZHAO EnGuang2.3 & ZHOU ShanGui2.3 1College of Applied Sciences, Beijing University of Technology, Beijing 10012., china 2.nstitute of theoretical Physics, Chinese Academy of Sciences, Beijing 100190, china 3center of theoretical nuclear Physics, national laboratory of heavy ion Accelerator, lanzhou 730000, china College of Applied Sciences Beijing University of Technology Beijing China Institute of theoretical Physics Chinese Academy of Sciences Beijing China center of theoretical {2. Physics National Laboratory of Heavy Ion Accelerator Lanzhou China

The stability of excited superheavy nuclei (SHN) with 100 Z 134 against neutron emission and fission is investigated by using a statistical model. In particular, a systematic study of the survival probability against fission in the 1n-channel of these SHN is made. The present calculations consistently take the neutron separation energies and shell correction energies from the calculated results of the finite range droplet model which predicts an island of stability of SHN around Z = 115 and N = 179. It turns out that this island of stability persists for excited SHN in the sense that the calculated survival probabilities in the 1n-channel of excited SHN at the optimal excitation energy are maximized around Z = 115 and N = 179. This indicates that the survival probability in the 1n-channel is mainly determined by the nuclear shell effects.

关键词： survival probability superheavy elements island of stability neutron emission fission

The study of energy bands in nucleus ^(102.Zr

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Science china(Physics,Mechanics & Astronomy) 2010年第1期53卷 106-110页

作者： DONG GuoXiang 1,2., YU ShaoYing 1,2.3 , LIU YanXin 1 , SHEN CaiWan 1,2.4 & DONG YongSheng 1,2.5I School of Science, Huzhou Teachers College, Huzhou 313000, china 2.School of Science and Information Engineering, Zhejiang Normal University, Jinhua 32.000, china 3 Institute of theoretical Physics, Chinese Academy of Sciences, Beijing 100080, china 4 center of theoretical nuclear Physics, national laboratory of heavy ion Accelerator of {12., lanzhou 730000, china 5 Department of Physics, Jining Teachers College, Jining 012.00, china School of Science Huzhou Teachers College Huzhou China School of Science and Information Engineering Zhejiang Normal University Jinhua China Institute of theoretical Physics Chinese Academy of Sciences Beijing China center of theoretical {2. Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China Department of Physics Jining Teachers College Jining China

theoretical calculations of the energy bands in nucleus 102.Zr are carried out by taking the projected shell model approach, which has reproduced the experimental data. In addition, by analyzing band-head energies, corresponding configurations of yrast band, quasi-particle rotational bands and side bands, we have worked out the microscopic formation mechanism of axially symmetric deformation bands: The low-excitation deformation bands are attributed to the high-j intruder states 1g 7/2.and 1h 11/2.in the N=4, 5 shells; the quasi-particles in the orbit v5/2.[532., v3/2.[411] and v3/2.[413] in particular play an important role in the deformation of 102.Zr.

关键词： projected shell model yrast band quasi-particle rotational band side band

Topological Structure of Vortex Solution in Jackiw-Pi Model

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Communications in theoretical Physics 2007年第7期48卷 143-146页

作者： LI Xi-Guo LIU Zi-Yu LI Yong-Qing GAO Yuan GUO Yan-Rui XIAO Guo-Qing1 Institute of Modern Physics,the Chinese Academy of Sciences,P.O.Box 31,lanzhou 730000,china2.Graduate School,the Chinese Academy of Sciences,Beijing 100049,china3 center of theoretical nuclear Physics,national laboratory of heavy ion Collisions,lanzhou 730000,china Institute of Modern Physics the Chinese Academy of Sciences P.O. Box 31 Lanzhou 730000 China center of theoretical {2. Physics National Laboratory of Heavy Ion Collisions Lanzhou 730000 China Graduate School the Chinese Academy of Sciences Beijing 100049 China

By using φ-mapping method,we discuss the topological structure of the self-duality solution in Jackiw-Pimodel in terms of gauge potential *** set up relationship between Chern-Simons vortex solution andtopological number,which is determined by Hopf index and Brouwer *** also give the quantization of flux inthis ***,we study the angular momentum of the vortex,which can be expressed in terms of,the flux.

关键词： topological structure vortex Jackiw-Pi model

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 102.13, china 4 Institute of theoretical Physics, Chinese Academy of Sciences, Beijing 100080, china 5 center of theoretical nuclear Physics, national laboratory of {12. ion Accelerator of lanzhou, lanzhou 730000, china School of Science Huzhou Teachers College Huzhou China College of Mathematics Physics and Information Engineering Zhejiang Normal University Jinhua China Institute of theoretical Physics Chinese Academy of Sciences Beijing China center of theoretical {2. Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China china Institute of Atomic Energy Beijing 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

Theory study of shapes in ^(187,189)Tl nuclei

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Science china(Physics,Mechanics & Astronomy) 2009年第6期52卷 818-821页

作者： LIU YanXin1, YU ShaoYing1,2.3, SHEN CaiWan1,5 & DONG YongSheng1,2.4 1 School of Science, Huzhou Teachers College, Huzhou 313000, china 2.School of Science and Information Engineering, Zhejiang Normal University, Jinhua 32.000, china 3 Institute of theoretical Physics, Chinese Academy of Sciences, Beijing 100080, china 4 Department of Physics, Jining Teachers College, Jining 012.00, china 5 center of theoretical nuclear Physics, national laboratory of heavy ion Accelerator of lanzhou, lanzhou 730000, china School of Science Huzhou Teachers College Huzhou China School of Science and Information Engineering Zhejiang Normal University Jinhua China Institute of theoretical Physics Chinese Academy of Sciences Beijing China center of theoretical {2. Physics National Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou China Department of Physics Jining Teachers College Jining China

The nuclear shapes of 187,189Tl were investigated theoretically in this work. The total routhian surface (TRS) calculat{2.s were performed for N=106 and 108 isotopes of thallium (Z=81). The single-particle energies were obtained from the deformed Woods-Saxon potential, with the Lipkin-Nogami (LN) treatment of pairing. It is found that the collective oblate rotat{2. coexists with the high-K prolate rotat{2.. Superdeformed prolate rotat{2. is included in this calculat{2..

关键词： nuclear shape oblate rotation prolate rotation