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Study of proton resonances in ^(18)Ne via resonant elastic scattering of ^(17)F+p and its astrophysical implication

Science China(Physics,Mechanics & Astronomy) 2011年第S1期54卷 32-36页

作者： HE JianJun1, HU Jun1,2. XU ShiWei1, CHEN ZhiQiang1, ZHANG XueYing1, WANG JianSong1, YU XiangQing1, ZHANG LiYong1,2. LI Long1,2. YANG YanYun1,2. MA Peng1,2. ZHANG XueHeng1, HU ZhengGuo1, GUO ZhongYan1, XU Xing1,2. YUAN XiaoHua1, LU Wan1,2. YU YuHong1, ZANG YongDong1,2. TANG ShuWen1,2. YE RuiPing1,2. CHEN JinDa1,2. JIN ShiLun1,2. DU ChengMing1,2. WANG ShiTao1,2. MA JunBing1,2. LIU LongXiang1,2. BAI Zhen1,2. LEI XiangGuo1, SUN ZhiYu1, ZHANG YuHu1, ZHOU XiaoHong1, XU HuShan1, SU Jun3, LI ErTao3, WANG HongWei4, TIAN WenDong4 & LI XiangQing5 1 institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China 2.Graduate University of Chinese Academy of Sciences, beijing 100049, China 3 China institute of atomic energy (CIAE), beijing 102.13, China 4 Shanghai institute of Applied Physics (SINAP), Chinese Academy of Sciences, Shanghai 2.1800, China 5 School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, beijing 100871, China 1. institute of Modern Physics (IMP) Chinese Academy of Sciences Lanzhou 730000 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. China Institute of Atomic Energy (CIAE) Beijing 102413 China4. Shanghai Institute of Applied Physics (SINAP) Chinese Academy of Sciences Shanghai 201800 China5. School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China

The proton resonant properties in 18Ne, which determine the reaction rate of the key stellar 14O(α,p)17F reaction, have been studied by using a technique of proton resonant elastic scattering of 17F+p. A 4.2. MeV/nucleon 17F radioactive ion (RI) beam was produced via a projectile-fragmentation reaction, and separated by a Radioactive Ion Beam Line in Lanzhou (RIBLL). By bombarding a thick (CH2.n target, the energy spectra of the recoiled protons were measured by two ΔE-E silicon telescopes at the center-of-mass scattering angles of θc.m.≈175°±5°, θc.m.≈152.±8°, respectively. Several proton resonances in 18Ne were ob served clearly. A further R-matrix analysis of the experimental data is under way to determine the resonant parameters. The present work reports the preliminary results briefly.

关键词： resonant reaction reaction rate explosive burning accreting binary systems

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锶原子光晶格钟

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物理学报 2018年第16期67卷 110-130页

作者：林弋戈方占军中国计量科学研究院北京100029 国家时间频率计量中心北京100029

进入2.世纪以来,锶原子光晶格钟经历了快速的发展,系统频移的不确定度指标已经超越现有的秒定义基准铯原子喷泉钟,进入到10^(-18)量级,体现了人类精密测量能力的最高水平,是精密测量物理的热点研究内容.本综述简要介绍了锶原子光晶格钟... 详细信息

进入2.世纪以来,锶原子光晶格钟经历了快速的发展,系统频移的不确定度指标已经超越现有的秒定义基准铯原子喷泉钟,进入到10^(-18)量级,体现了人类精密测量能力的最高水平,是精密测量物理的热点研究内容.本综述简要介绍了锶原子光晶格钟的发展水平;详细介绍了锶原子光晶格钟的各个组成部分和关键技术、如何进行精密光谱探测和闭环锁定以及各项系统频移的不确定度评估方法和锶原子跃迁绝对频率测量的方法等;最后简要介绍了锶光钟的应用和未来发展趋势.

关键词：原子钟光钟光晶格锶原子

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Resonant Continuum in the Exotic Nuclei

Resonant Continuum in the Exotic Nuclei

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第十二届全国核物理大会暨第七届会员代表大会

作者： Ma Zhongyu~1 and Cao Ligang~2.1 China institute of atomic {2., beijing 102.13 2.institute of High {2. Physics, beijing 100039

The correlation to the continuum gets more and more important when the nucleus close to the drip line. It becomes a significant issue how to exactly or properly treat the continuum in the study of nuclear structure recently. There exists a bunch of resonant states with life times in the continuum for heavy nuclei. Single-particle resonant-states in the continuum can be determined by solving scattering states of the

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基于原子干涉仪的微观粒子弱等效原理检验

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物理学报 2018年第16期67卷 45-56页

作者：王谨詹明生中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室武汉430071 中国科学院冷原子物理中心武汉430071

等效原理是广义相对论的两个基本假设之一,也是爱因斯坦对弱等效原理的推广.目前,大量实验证明弱等效原理在一定的实验精度内是成立的.将引力与标准模型统一起来的新理论都要求弱等效原理破缺,因此更高精度的弱等效原理检验具有重要的... 详细信息

等效原理是广义相对论的两个基本假设之一,也是爱因斯坦对弱等效原理的推广.目前,大量实验证明弱等效原理在一定的实验精度内是成立的.将引力与标准模型统一起来的新理论都要求弱等效原理破缺,因此更高精度的弱等效原理检验具有重要的科学意义.本文介绍了原子干涉仪的原理,回顾了利用原子干涉仪开展微观粒子弱等效原理检验实验研究的历史和现状,介绍了双组分原子干涉仪检验弱等效原理实验涉及的振动噪声抑制、拉曼光移频与相位噪声抑制、四波双衍射拉曼跃迁原子干涉、信号探测与数据处理等关键问题及研究进展,分析了高精度微观粒子弱等效原理检验研究的发展趋势,介绍了长基线原子干涉仪、空间原子干涉仪、超冷原子源以及纠缠原子源制备等方面的研究动态,展望了微观粒子弱等效原理检验研究的发展前景.

关键词：弱等效原理检验原子干涉仪精密测量

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Observation of signature inversion in the πh_(9/2.(×)νi_(13/2. oblate band

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Science China(Physics,Mechanics & Astronomy) 2005年第4期48卷 442-449页

作者： XIE Chengying1,2. ZHOU Xiaohong1,2. ZHANG Yuhu1, GUO Yingxiang1, LEI Xiangguo1, ZHENG Yong1, LIU Minliang1, SONG Litao1, WANG Hualei1, YU Haiping1, GUO Wentao 1, LUO Peng1, WU Zhijun1, ZHU Lihua3 & WU Xiaoguang3 ⒈ institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China ⒉ Graduate School of the Chinese Academy of Sciences, beijing 100049, China ⒊ institute of atomic energy Research, beijing 102.13, China institute of Modern Physics Chinese Academy of Sciences Lanzhou China Graduate School of the Chinese Academy of Sciences Beijing China institute of atomic {2. Research Beijing China

High-spin states in 190Tl have been studied via the 160Gd(35Cl, 5nγ) reaction. The level scheme, consisting of the π h9 /2. νi13/2.oblate band and a cascade with character of single particle excitations, has been established. Spin values have been firmly assigned to the oblate band in 190Tl, resulting in low-spin signature inversion in the π h9 /2. νi13/2.oblate band for the first time. Based on the similarity of the level structure in doubly odd Tl nuclei, spin values for the oblate bands in 192.2.0Tl should be re-assigned, and a consistent low-spin signature inversion has occurred in these oblate deformed nuclei. The low-spin signature inversion phenomena can be interpreted qualitatively by using the 2.quasiparticle plus rotor model including p-n residual interactions.

关键词： deformed odd-odd 190Tl, oblate rotational bands, signature inversion, 2.qp+rotor model.

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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 atomic {2., beijing 102.13) China institute of atomic {2. 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

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Study of the primordial lithium abundance

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Science China(Physics,Mechanics & Astronomy) 2011年第S1期54卷 67-72页

作者： LI ZhiHong1, LI ErTao1, SU Jun1, LI YunJu1, BAI XiXiang1, GUO Bing1, WANG YouBao1, CHEN YongShou1, HOU SuQing1, ZENG Sheng1, LIAN Gang1, SHI JianRong2.& LIU WeiPing1 1 China institute of atomic {2., beijing 102.13, China 2.ational Astronomical Observatories, Chinese Academy of Sciences, beijing 100012. China China Inst Atom energy Beijing 102413 Peoples R China Chinese Acad Sci Natl Astron Observ Beijing 100012 Peoples R China

Lithium isotopes have attracted an intense interest because the abundance of both 6Li and 6Li from big bang nucleosynthesis (BBN) is one of the puzzles in nuclear astrophysics. Many investigations of both astrophysical observation and nucleosynthesis calculation have been carried out to solve the puzzle, but it is not solved yet. Several nuclear reactions involving lithium have been indirectly measured at China institute of atomic {2., beijing. The Standard BBN (SBBN) network calculations are then performed to investigate the primordial Lithium abundance. The result shows that these nuclear reactions have minimal effect on the SBBN abundances of 6Li and 7Li.

关键词： big bang nucleosynthesis element abundance nuclear reaction network

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Random Phase Approximation in Relativistic Approach

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原子核物理评论 2009年第S1期26卷 49-54页

作者： MA Zhong-yu1,2.YANG Ding1,TIAN Yuan1,CAO Li-gang2.3(1 China institute of atomic {2.,beijing 102.13,China 2.Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Research Facility in Lanzhou,Lanzhou 730000,China 3 institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China) China institute of atomic {2. Beijing 102413China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China China institute of atomic {2. Beijing 102413China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Research Facility in LanzhouLanzhou 730000China institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

Some special issues of the random phase approximation(RPA) in the relativistic approach are reviewed. A full consistency and proper treatment of coupling to the continuum are responsible for the successful application of the RPA in the description of dynamical properties of finite nuclei. The fully consistent relativistic RPA(RRPA) requires that the relativistic mean filed (RMF) wave function of the nucleus and the RRPA correlations are calculated in a same effective Lagrangian and the consistent treatment of the Dirac sea of negative energy states. The proper treatment of the single particle continuum with scattering asymptotic conditions in the RMF and RRPA is discussed. The full continuum spectrum can be described by the single particle Green's function and the relativistic continuum RPA is established. A separable form of the paring force is introduced in the relativistic quasi-particle RPA.

关键词： fully consistent RRPA coupling to the continuum pairing correlation

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高准确度的钙离子光频标

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物理学报 2018年第16期67卷 155-164页

作者：管桦黄垚李承斌高克林中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室武汉430071 中国科学院武汉物理与数学研究所中国科学院原子频标重点实验室武汉430071 中国科学院冷原子物理中心(武汉) 武汉430071

近年来,冷原子技术和激光技术促进了高精度光频标的发展,有望在建立时间基准、推动基础研究和满足国家需求等方面发挥重要的作用.本文介绍了中国科学院武汉物理与数学研究所近年来在高准确度钙离子(^(40)Ca^+)光频标研究方面的进展:采... 详细信息

近年来,冷原子技术和激光技术促进了高精度光频标的发展,有望在建立时间基准、推动基础研究和满足国家需求等方面发挥重要的作用.本文介绍了中国科学院武汉物理与数学研究所近年来在高准确度钙离子(^(40)Ca^+)光频标研究方面的进展:采用新的ULE腔系统,实现了72. nm钟跃迁激光器1—100 s的频率稳定度均优于2.10^(-15),通过对外场和环境效应的控制及克服,特别是囚禁离子运动效应的抑制,获得单个钙离子光频标的不确定度优于5.5×10^(-17);通过两台光频标的比对,测得2.000 s的稳定度也进入10^(-17)量级;基于高精度钙离子光频标平台,进行了相关精密测量的工作,包括:基于全球定位系统的超高精度远程光频绝对值测量方案,第二次测量了钙离子的光频跃迁绝对值,该测量结果再次被国际时间频率咨询委员会采纳,更新了钙离子的频率推荐值;精确测量了钙离子的钟跃迁魔幻波长,由此提出新型的全光囚禁离子光频标的方法;精密测量了钙离子的亚稳态寿命等参数.以上工作推动了基于冷原子的精密测量工作.

关键词：光频标精密测量钙离子魔幻波长

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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 {2.,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 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 atomic {2. 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

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