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国家自然科学基金(11275248)

作品数:12 被引量:15H指数:3
相关作者:周善贵张振华温凯曾谨言贺晓涛更多>>
相关机构:中国科学院北京大学南京航空航天大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划中国科学院知识创新工程重要方向项目更多>>
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12 条 记 录,以下是 1-10
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费米海与狄拉克海中的单粒子态--从球形核狄拉克方程说起被引量:4
2016年
在原子核的协变密度泛函理论中,核子的运动方程——狄拉克方程是核心内容之一.本评述结合球形核中核子狄拉克方程的数值求解,讨论费米海与狄拉克海中单粒子态及若干相关的物理问题.首先以打靶法为例较为详细地介绍在坐标空间中求解狄拉克方程的过程,以伍兹-萨克森基(包括薛定谔-伍兹-萨克森基和狄拉克-伍兹-萨克森基)展开方法为例介绍在基空间中狄拉克方程的求解方法.完备性的条件要求狄拉克-伍兹-萨克森基空间不仅要包括费米海中的正能量态,而且要包括狄拉克海中的负能量态.因此,需要把单粒子态的研究从正能量态拓展到负能量态.结合负能量态的研究,介绍与这些负能量态对应的反核子谱中存在的自旋对称性及其起源.
周善贵
关键词:狄拉克方程赝自旋对称性
CDCC calculations of fusion of 6Li with targets 144Sm and 154Sm:effect of resonance states
2017年
Continuum Discretized Coupled-Channel(CDCC) model calculations of total, complete and incomplete fusion cross sections for reactions of the weakly bound 6Li with 144,154Sm targets at energies around the Coulomb barrier are presented. In the cluster structure frame of 6Li→α+d, short-range absorption potentials are considered for the interactions between the ground state of the projectile 6Li and α-d fragments with the target. In order to separately calculate complete and incomplete fusion and to reduce double-counting, the corresponding absorption potentials are chosen to be of different range. Couplings to low-lying excited states 2+, 3-of 144Sm and 2+, 4+ of 154Sm are included. So, the effect on total fusion from the excited states of the target is investigated. Similarly, the effect on fusion due to couplings to resonance breakup states of 6Li, namely, l = 2,Jπ= 3+, 2+, 1+ is also calculated.The latter effect is determined by using two approaches,(a) by considering only resonance state couplings and(b)by omitting these states from the full discretized energy space. Among other things, it is found that both resonance and non-resonance continuum breakup couplings produce fusion suppression at all the energies considered.
A.Gómez CamachoJ.Lubian张焕乔周善贵
关键词:CDCCCOMPLETE
对关联在反磁转动中的作用(英文)
2017年
采用基于推转壳模型的粒子数守恒方法对^(105)Cd和^(106)Cd中的反磁转动带进行了研究,在计算当中,粒子数严格守恒,并且堵塞效应也是严格考虑的。计算结果很好地再现了实验上观测到的I-?关系、转动惯量以及约化跃迁几率B(E2)。通过检验双剪角,即两个质子空穴角动量的合拢,对反磁转动中的双剪刀机制进行了分析。研究表明剪刀角的合拢非常敏感地依赖于对关联。
张振华
关键词:对关联粒子数守恒方法
Angular Anisotropy of the Fission Fragments in the Dinuclear System Model
2015年
A theoretical evaluation of the collective excitation spectra of nucleus at large deformations is possible within the framework of the dinuclear system(DNS) model, which treats the wave function of the fissioning nucleus as a superposition of a mononucleus configuration and two-cluster configurations in a dynamical way, permitting exchange of nucleons between clusters. In this work the method of calculation of the potential energy and the collective spectrum of fissioning nucleus at scission point is presented. Combining the DNS model calculations and the statistical model of fission we calculate the angular distribution of fission fragments for the neutron–induced fission of239 Pu.
T.M.ShneidmanA.V.AndreevC.MassimiM.T.PigniG.VanniniA.Ventura周善贵
关键词:STATESNUCLEIDINUCLEARFISSIONANGULARANISOTROPY
Investigation of the two-quasiparticle bands in the doubly-odd nucleus ^(166)Ta using a particle-number conserving cranked shell model
2016年
The high-spin rotational properties of two-quasiparticle bands in the doubly-odd 166Ta are analyzed using the cranked shell model with pairing correlations treated by a particle-number conserving method, in which the blocking effects are taken into account exactly. The experimental moments of inertia and alignments and their variations with the rotational frequency hw are reproduced very well by the particle-number conserving calculations, which provides a reliable support to the configuration assignments in previous works for these bands. The backbendings in these two-quasiparticle bands are analyzed by the calculated occupation probabilities and the contributions of each orbital to the total angular momentum alignments. The moments of inertia and alignments for the Gallagher-Moszkowski partners of these observed two-quasiparticle rotational bands are also predicted.
ZhenHua Zhang
Theoretical study on fusion dynamics and evaporation residue cross sections for superheavy elements被引量:1
2013年
The nuclear dynamical deformation,the fusion probability and the evaporation residue(ER) cross sections for the synthesis of superheavy nuclei are studied with the di-nuclear system model and the related dynamical potential energy surface.The intrinsic energy and the maximum dynamical deformations for48Ca+248Cm are calculated.The effect of dynamical deformation on the potential energy surface and fusion is investigated.It is found that the dynamical deformation influences the potential energy surface and fusion probability significantly.The dependence of the fusion probability on the angular momentum is investigated.The ER cross sections for some superheavy nuclei in48Ca induced reactions are calculated and it is found that the theoretical results are in good agreement with the experimental results.
WANG NanZHAO EnguangZHOU Shangui
关键词:蒸发残渣超重元素超重核合成势能面
Investigation of the high-spin rotational properties of the proton emitter ^113Cs using a particle-number conserving method
2017年
The recently observed two high-spin rotational bands in the proton emitter ^113Cs are investigated using the cranked shell model with pairing correlations treated by a particle-number conserving method, in which the Pauli blocking effects are taken into account exactly. By using the configuration assignments of band 1 [π3/2^+[422](g7/2), α =-1/2] and band 2 [π1/2^+[420](d5/2), α=1/2], the experimental moments of inertia and quasiparticle alignments can be reproduced much better by the present calculations than those using the configuration assginment of π1/2^-[550](h11/2), which in turn may support these configuration assignments. Furthermore, by analyzing the occupation probability nμ of each cranked Nilsson level near the Fermi surface and the contribution of each orbital to the angular momentum alignments, the backbending mechanism of these two bands is also investigated.
张振华徐鹏
Investigation of the Mg isotopes using the shell-model-like approach in relativistic mean field theory
2016年
Ground state properties for Mg isotopes, including binding energies, one- and two-neutron separation energies, pairing energies, nuclear matter radii and quadrupole deformation parameters, are obtained from the self- consistent relativistic mean field (RMF) model with the pairing correlations treated by a shell-mode-like approach (SLAP), in which the particle-number is conserved and the blocking effects are treated exactly. The experimental data, including the binding energies and the one- and two-neutron separation energies, which are sensitive to the treatment of pairing correlations and block effects, are well reproduced by the RMF+SLAP calculations.
白洪波张振华李晓伟
Effect of tensor force on dissipation dynamics in time-dependent Hartree-Fock theory被引量:8
2014年
The role of tensor force on the collision dynamics of16O+16O is investigated in the framework of a fully three-dimensional timedependent Hartree-Fock theory.The calculations are performed with modern Skyrme energy functional plus tensor terms.Particular attention is given on the analysis of dissipation dynamics in heavy-ion collisions.The energy dissipation is found to decrease as an initial bombarding energy increases in deep-inelastic collisions for all the Skyrme parameter sets studied here because of the competition between the collective motion and the single-particle degrees of freedom.We reveal that the tensor forces may either enhance or reduce the energy dissipation depending on the different parameter sets.The fusion cross section without tensor force overestimates the experimental value by about 25%,while the calculation with tensor force T11 has good agreement with experimental cross section.
DAI GaoFengGUO LuZHAO EnGuangZHOU ShanGui
From strangelets to strange stars:a unified description
2016年
The conventionally separated treatments for strangelets and strange stars are now unified with a more comprehensive theoretical description for objects ranging from strangelets to strange stars. After constraining the model parameter according to the Witten–Bodmer hypothesis and observational mass–radius probability distribution of pulsars, we investigate the properties of this kind of objects. It is found that the energy per baryon decreases monotonically with increasing baryon number and reaches its minimum at the maximum baryon number, corresponding to the most massive strange star. Due to the quark depletion,an electric potential well is formed on the surface of the quarkpart. For a rotational bare strange star, a magnetic field with the typical strength in pulsars is generated.
Cheng-Jun XiaGuang-Xiong PengEn-Guang ZhaoShan-Gui Zhou
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