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1.
A two-dimensional Total Routhian Surface (TRS) calculation with the fixed hexadecapole 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. 相似文献
2.
LI ZhiHong LI ErTao SU Jun LI YunJu BAI XiXiang GUO Bing WANG YouBao CHEN YongShou HOU SuQing ZENG Sheng LIAN Gang SHI JianRong & LIU WeiPing China Institute of Atomic Energy Beijing China National Astronomical Observatories Chinese Academy of Sciences Beijing 《中国科学:物理学 力学 天文学(英文版)》2011,(Z1)
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 perfo... 相似文献
3.
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 China 《中国科学:物理学 力学 天文学(英文版)》2010,(4)
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. 相似文献
4.
ZHANG YouJin CHEN YongShou GUO JianYou HOU SuQing LI ZhiHong SHI JianRong 《中国科学:物理学 力学 天文学(英文版)》2013,(5):859-865
The heavy elements in the Universe are formed during the s- and r-processes mainly in AGB stars and supernovae, respectively. Simulation of s- and r-nucleosynthesis critically depends on the neutron capture and weak decay rates for all the nuclei on the reaction chain. The present work analyzes systematically the neutron capture rates (cross sections) for the s-process nuclei, including ~3000 rates on ~200 nuclei. The network calculations for the constant temperature s-process have been performed using the different data sets selected as the nuclear inputs to investigate the uncertainties in the predicted s-abundances. We show that the available cross sections of neutron capture on many s-process nuclei still carry large uncertainties, which lead to low accuracy in the determination of s-process isotope abundances. We analyze the neutron capture cross section data for the same unique isobar nucleus accorded by year from previous work. Such an analysis indicates that the s-process has been studied for more than fifty years and there exist two research stages around 1976 and 2002, respectively. The needs and opportunities for future experiments and theoretical tools are highlighted to remove the existing shortcomings in the neutron capture rates. 相似文献
5.
从结合能实验值提取n-p相互作用能εip-jn,系统比较了奇奇核单质子单中子相互作用能ε1p-1n与相邻奇A核相应量的平均值,发现前者普遍大于后者.提出奇奇核n-p增强的解释为,GMshift效应和同类核子对关联对奇A核n-p相互作用的削弱效应.同时指出,奇质子核的ε1p-2n相当好地近似等于同质量数奇中子核的ε2p-1n,并且这与Garvey-Kelson关系是等价的. 相似文献
6.
Yun Zheng LiHua Zhu YongShou Chen XiaoGuang Wu ChuangYe He Xin Hao Ying Liu ZhiMin Wang XueQin Li GuangSheng Li ZaoChun Gao HuiBin Sun 《中国科学:物理学 力学 天文学(英文版)》2014,57(9):1669-1675
The lifetimes for the states of magnetic dipole band in106Ag have been measured using the Doppler-shift attenuation method via the reaction of100Mo(11B,5n)106Ag at a beam energy of 60 MeV.The reduced transition strengths of the magnetic dipole band,the B(M1)/B(E2)ratios together with the signature of the level energy as a function of angular momentum for the positive parity states of106Ag show that a drastic change of excitation mode,that is,from electric rotation to magnetic rotation,occurs within one unit of spin at around Iπ=12+.Theoretical calculations based on the triaxial projected shell model consistently reproduce the experimental data and provide an explanation on the nature of observed phenomena such that the dynamical drift of the rotational axis suddenly from the principal axis to the tilted one,along the positive parity bands of106Ag. 相似文献
7.
Liu WeiPing Li ZhiHong Bai XiXiang Wang YouBao Guo Bing Peng ChaoHua Yang Yi Su Jun Cui BaoQun Zhou ShuHua Zhu ShengYun Xia HaiHong Guan XiaLing Zeng Sheng Zhang HuanQiao Chen YongShou Tang HongQing Huang Li Feng BeiYuan 《中国科学:物理学 力学 天文学(英文版)》2011,54(1):14-17
China Institute of Atomic Energy (CIAE) is currently constructing Beijing rare ion beam facility (BRIF) and is proposing China advanced rare ion beam facility (CARIF). This paper is aiming at introducing the progress of BRIF project and the conceptual design CARIF. The ISOL type facility BRIF under construction is composed of a 100 MeV 300 μA proton cyclotron, an ISOL with mass resolution of 20000, and a super-conducting LINAC of 2 MeV/q, and will be commissioned in 2013. CARIF facility proposed is planned to use both ISOL and PF techniques. It is based on a China advanced research reactor CARR that was critical, with ISOL separation of fission fragment, post acceleration to 150 MeV/u, and fragmentation of neutron-rich fission fragment beam like 132Sn. Such unique combination will allow CARIF to deliver beam intensity better than the best world facilities by more than one order of magnitude. 相似文献
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9.
The projected total energy surface(PTES)approach has been developed based on the triaxial projected shell model(TPSM)hybridized with the macroscopic–microscopic method.The total energy of an atomic nucleus is decomposed into macroscopic,microscopic and rotational terms.The macroscopic and microscopic components are described with the liquid drop model and Strutinsky method,respectively,and the rotational energy is given by the TPSM,the term beyond the mean field.To test theory,the PTES calculations have been carried out for the yrast states of the well deformed rare earth nucleus172W,and the theoretical results are in good agreement with the experimental data.By using the equilibrium quardrupole deformations(ε2andγ)determined by the PTES,the calculation of the transition quardrupole moment(Qt)in function of spin also reproduces the experimental data.A comparison between the PTES and TRS methods has been made for theoretical and application uses. 相似文献
10.
Li ZhiHong Li ErTao Su Jun Li YunJu Bai XiXiang Guo Bing Wang YouBao Chen YongShou Hou SuQing Zeng Sheng Lian Gang Shi JianRong Liu WeiPing 《中国科学:物理学 力学 天文学(英文版)》2011,54(1):67-72
Lithium isotopes have attracted an intense interest because the abundance of both 6Li and 7Li 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. 相似文献