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国家重点基础研究发展计划(2007CB815003)

作品数:17 被引量:13H指数:3
相关作者:苏俊柳卫平秦星连钢李云居更多>>
相关机构:中国原子能科学研究院郑州大学山西师范大学更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金更多>>
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17 条 记 录,以下是 1-10
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^6He(p,γ)^7Li反应的实验设计与束流准备被引量:2
2008年
在HI-13串列加速器次级束流线上,使用7Li初级束,通过2H(7Li,6He)3He反应产生了能量为26、32和38 MeV的放射性6He次级束,纯化并准直后,6He次级束流纯度可达99%,强度最大为900 s-1。使用该次级束可实现对2H(6He,7Li)n反应的角分布测量,并结合理论计算,间接导出6He(p,γ)7Li的天体物理S因子和反应率。
李云居李志宏白希祥郭冰连钢苏俊王宝祥王友宝曾晟秦星蒋超柳卫平赵维娟
关键词:速度选择器核天体物理
Study of the primordial lithium abundance被引量:3
2011年
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 Energy, 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.
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 Energy, Beijing 102413, China
关键词:BIGNUCLEOSYNTHESISELEMENTABUNDANCENUCLEAR
天体物理重要反应^(13)N(p,γ)^(14)O的实验研究
2009年
13N(p,γ)14O是高温CNO循环中的关键反应,对恒星能量产生机制及其演化的研究具有重要意义。利用北京HI-13串列加速器次级束流线产生的13N放射性束测量了质心系能量为8.9 MeV的13N(d,n)14O反应的角分布,导出了14O基态渐进归一化系数(ANC)为(29.4±5.3)fm-1。此外,使用镜像核的电荷对称性,通过分析13C(d,p)14C反应的角分布,导出了与实验一致的14O基态质子ANC。使用最新开发出的R矩阵程序,导出13N(p,γ)14O反应在高温CNO循环中的天体物理S因子和反应率。将此数据代入核天体物理反应的网络程序进行计算,结果表明,新星中CNO循环产生的能量比原有的结果多5%,这可能会对新星的演化有一定的影响。
郭冰李志宏颜胜权连钢白希祥王友宝曾晟苏俊王宝祥柳卫平舒能川陈永寿常宏伟江厉阳
关键词:角分布
17F+p弹性共振散射的厚靶实验与分析
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金孙均
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Determination of the ^(12)C(p, γ)^(13)N reaction rates fromthe ^(12)C(~7Li,~6He)^(13)N reaction被引量:6
2010年
The angular distribution of the 12C(7Li,6He)13N reaction at E(7Li) = 44.0 MeV was measured at the HI-13 tandem accelerator of Beijing, China. The asymptotic normalization coefficient (ANC) of 13N → 12C + p was derived to be (1.64 ± 0.11) fm-1/2 through the distorted wave Born approximation (DWBA) analysis. The ANC was then used to deduce the astrophysical S (E) factors and reaction rates for the 12C(p,γ)13N direct capture reaction at energies of astrophysical relevance.
LI ZhiHong, SU Jun, GUO Bing, LI ZhiChang, BAI XiXiang, LIU JianCheng, LI YunJu, YAN ShengQuan, WANG BaoXiang, WANG YouBao, LIAN Gang, ZENG Sheng, LI ErTao, CHEN YongShou, SHU NengChuan, FAN QiWen & LIU WeiPing China Institute of Atomic Energy, Beijing 102413, China
关键词:REACTIONDWBAASYMPTOTICNORMALIZATION
Indirect Measurement of Astrophysical ^(13)C(α,n)^(16)O S-Factors
2012年
The 13^C(a, n)160 reaction is believed to be the main neutron source reaction for the s-process in asymptotic giant branch (AGB) stars. The astrophysical S-factors of this reaction have been determined based on an evaluation of the a spectroscopic factor of the 1/2+ subthreshold state in 17^O (Ex = 6.356 MeV) by using the 13^C(11^B, 7^Li)17^O a transfer reaction. Our result confirms that the 1/2+ subthreshold resonance is dominant for the 13^C(a, n)16^O reaction at low energies of astrophysical interest.
郭冰李志宏李云居苏俊白希祥陈永寿樊启文金孙均李二涛李志常连钢刘鑫刘建成舒能川王宝祥王友宝颜胜权曾晟柳卫平庞丹阳M. LUGAROJ. BUNTAIN
关键词:S-PROCESS
Determination of the Astrophysically Relevant ~6Li(n,γ)~7Li Cross Sections from the ~7Li(~6Li,~7Li)~6Li Elastic-Transfer Reaction
2012年
Angular distributions for the 7^Li(6^Li, 7^Li)6^Li elastic-transfer reaction have been measured with the Q3D magnetic spectrograph at the HI-13 tandem accelerator of Beijing, China. The neutron spectroscopic factors of 7^Li are derived by comparing the calculated differential cross sections, which are obtained through the distorted-wave Born approximation (DWBA) calculation, to the experimental data. And these spectroscopic factors are then used to deduce the direct capture cross sections in 6^Li(n, γ)TLi at energies of astrophysical relevance.
苏俊李志宏郭冰白希祥李志常刘建成王友宝连钢曾晟王宝祥颜胜权李云居李二涛樊启文柳卫平
SPECIAL TOPICS:Study of the high spin states in stable nucleus ^(84)Sr被引量:3
2010年
The School of Nuclear Engineering and Technology at the East China Institute of Technology cooperated with the China Institute of Atomic Energy to investigate the high spin states of 84Sr. The study is reported in Volume 53 (October, 2010) of the SCIENCE
KANG XuZhong SHEN ShuiFa
关键词:高自旋态稳定核核工程原子能
国内外低能核理论的发展历史、现状和走势
2009年
大型核物理实验装置的问世和实验技术的进步,为核理论研究提供了越来越丰富的实验数据,检验着现有的理论,也为理论研究提出了新的课题,因而拓宽着核理论的研究领域。现代大型超级计算机的运算能力和运算速度的迅速提高以及数值计算方法的不断改进极大地提高了核多体计算的精确程度。核理论研究已进入了一个前所未有的迅速发展时期。本文就低能核理论的研究现状、国内近期主要研究进展和将来的发展趋势作简要分析和概述,并对核理论研究工作的今后发展提出了建议。
顾建中彭帮保邹文华曹天光
关键词:核结构核反应
New Measurement of Proton Transfer Reactions and Elastic Scattering for ~7Li + ^(13)C at 34 MeV
2012年
The 13C(7Li, 6He)laN reaction is measured at E(TLi) = 34 MeV with the Q3D mag- netic spectrometer of HI-13 tandem accelerator. Angular distributions at forward angles for proton transfer to the ground and the first excited states in 14N are obtained. In addition, angular distri- bution for 7Li + 13C elastic scattering is also measured. The optical potential parameters for the entrance and exit channels of the transfer reactions are derived by fitting the 7Li + 13C and 6Li + 14N elastic scattering experimental data, and their angular distributions are well reproduced by the distorted wave Born approximation calculations. A phase shift of about 2° between the calculations and the experiment data has been found in the earlier (TLi, 6He) study, whereas no such phase shift is observed in the present work.
李云居李志宏郭冰苏俊白希祥李二涛王宝祥颜胜权曾晟李志常刘建成刘鑫金孙均樊启文连钢王友宝柳卫平
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