U^＋＋的能级与UO^＋＋2的电子状态

用全相对论量子力学方法计算了电子组态为［Ｒｎ］５ｆ２６ｄ１７ｓ１的Ｕ的全部２１４个电子状态的能级，基态为５Ｋ５。设ＵＯ２为线型（Ｒ∞ｈ），Ｕ和Ｏ２均为基态，则ＵＯ２的可能电子状态有３，５，７Σ－ｇ，３，５，７πｇ，…。ＵＯ２的基态不大可能为１Σ＋ｇ。     

Stereodynamics of the reactions Ne＋H＋/Ne＋D2＋/Ne＋W2

The vector correlations between products and reagents for the reactions Ne＋H2＋, Ne＋D2＋, and Ne＋T2＋ are calculated by means of the quasi-classical trajectory method on a new potential energy surface constructed by Lfi et al, [J. Chem. Phys. 2010 132, 014303]. The polarization-dependent differential cross-sections （27π/σ）（dσ00/dωt）, （2π/σ）（dσ20/dwt）, （27π/σ）（dσ22＋/dwt）, and （2π/σ）（dσ21-/dwt）, and the distributions of P（θr）, P（φ）, and P（θr, Cr） are calculated. The isotopic effect, which is associated with the difference in mass factor among the three reactions, is revealed.     

态度＋概念＋积累＋反思＋善问＋细节=成功——谈高中物理学习方法

许多同学认为高中物理特别难学;学习时像雾里看花,听听简单,做做较难,考考完蛋.其实物理究竟是"悟理"还是"雾里",取决于同学们对自然现象的领悟程度和正确的学习方法;只要学习方法得当,处理好"what""how""why'的问题,改变学习态度,注重物理概念,坚持知识积累,积极反思总结,保持虚心善问,注意解题细节,就会取得好成绩.笔者结合多年教学经验,从六个方面谈谈高中物理的学习方法.     

He^＋＋H^—和Li^＋＋D^—碰撞的电荷转移截面计算

用多通道Ｌａｎｄａｕ－Ｚｅｎｅｒ方法计算了Ｈｅ＋＋Ｈ－和Ｌｉ＋＋Ｄ－低能碰撞过程中电荷转移截面，碰撞体系的初态与末态间的耦合矩阵元由渐近方法得到。计算结果与最近的实验结果进行了比较     

Chiral Lagrangian Treatment of 0^＋＋ Mesons and 0^＋＋ Glueballs

Within the framework of a nonlinear chiral Lagrangian the mass spectra and the decay properties of 0^＋＋ states below 2 GeV are studied. Assuming that f0（980）, a0（980）, K0（1430）, and f0（1500） comprise an SU（3） nonet, we make a detailed prediction about the static properties of the 0^＋＋ mesons. The substructure analysis of these states in terms of two- and four-quark components as well as a glueball component is carried out. We also consider the interaction Lagrangian and provide a preliminary study of the strong and radiative decays of the 0＋＋ mesons. The scalar glueball masses and partial widths are also presented. In view of the fact that few data of 0＋＋ mesons are clearly given in the present PDG （Particle Data Group） list and that the four-quark content of mesons is a hot issue both experimentally and theoretically, the predicted results of the paper may be helpful for upcoming experimental and theoretical studies of these mesons.     

Quasi-Classical Trajectory Study on Ar＋H2＋/D2＋/T2＋ Reactions

In order to explore the isotope effect on stereo dynamics, we investigate the trajectory calculations of Ar＋H2＋/D2＋/T2＋ and Ar＋T2＋ reactions on the ab initio potential energy surface constructed by us and calculate the distributions of product polarization P（θr）, P（r） and four generalized polarization-dependent differential cross-sections. The product rotational alignment parameters （P2（j＇ · k）） for the title reactions are compared and discussed with mass factors. Furthermore, the angular distributions of the product rotational vectors in the form of polar plot in θr and r are presented. The results indicate that the stereo dynamics properties of the title reactions are sensitive to the mass factor.     

Photoassociation Reactions H＋D^＋ and H^＋ ＋D in Ultrashort Pulse Laser Fields

The photoassociation reactions H＋D^＋ and H＋ ＋D induced by the one- and two-colour laser pulses are theoretically studied. The reactions occur through two channels： （i） H（1S）＋D^＋ →HD^＋, and （ii） H^＋ ＋D（1S）→HD^＋. The reaction probability through channel （ii） is higher than through channel （i）. The populations of the products H^＋ ＋D and HD＋ and the ratio of H^＋ ＋D to HD＋ can be controlled by laser pulses. The two-colour laser pulses can more efficiently lower the dissociation probability and therefore enhance the yield ratio of the product HD＋.     

Stereodynamics of the He ＋ D2^＋ → HeD^＋ ＋ D Reaction on the PALMIERI Surface

Using the quasi-classical trajectory method, the product rotational polarization of the ion-molecule reaction He^＋D2^＋ has been calculated at different collision energies on the PALMIERI potential energy surface [Palmieri et al. Mol. Phys. 98 （2000） 1835]. The distribution angle between k and j′, P（Or）, the distribution of the dihedral angle P（Фr）, and the angular distribution of product rotational vectors in the form of polar plots in θr and Фr are calculated. In addition, four polarization-dependent differential cross sections are also presented in the center-of-mass frame, respectively. The results indicate that the rotational polarization of the product HeD^＋ presents different characters for different collision energies. These discrepancies may be ascribed to the different collision energies and constructions of the potential energy surface.     

Measurement of PV asymmetry in n＋p→d＋γ and γ＋d→n＋p

The measurement of parity-violating （PV） observables in few-nucleon system can shed light on our current understanding of the weak interaction between nucleons.Theoretical models describe the nucleonnucleon weak interaction at low energies use a series of undetermined parameters.Two parity violating measurements have been considered： the capture of polarized slow neutrons on hydrogen （n ＋ p → d ＋ γ） at Los Alamos National Laboratory for first phase and Oka Ridge National Laboratory for second phase and the helicity dependence of the deuteron photodisintegration cross section using circularly polarized photons （γ ＋ d → n ＋ p） at Shanghai Institute of Applied Physics.The goal of both experiments is to constraint the weak meson-nucleon couplings to a precision of 1 ×10^-8 .The introduction of both experiments is presented.     

类镍Hf^44＋,Ta^45＋,W^46＋,Re^47＋,Pt^50＋,Au^51＋能级结构…

本文用多组态Ｄｉｒａｃ－Ｆｏｃｋ（ＭＣＤＦ）法计算了类镍Ｈｆ＾４４＋、Ｔａ＾４５＋、Ｗ＾４６＋、Ｒｅ＾４７＋、Ｐｔ＾５０＋、Ａｕ＾５１＋能级的精细结构和ｎ＝３－４偶极跃迁辐射的振子强度，得到了和实验符合得相当好的结果（对有实验数据的跃迁波长而言），并对组态的选取、核模型和、Ｂｒｅｉｔ修正和ＱＥＤ效应作了讨论，指出对于本文研究体系，ＱＥＤ效应对跃迁的贡献可以忽略。     

New Physics Effects on Rare Decays Bu^＋ → π^＋e^＋e^-, ρ^＋e^＋e^- in a Top Quark Two-Higgs-Doublet Model

Using the form factors from light-cone sum rules, we study the branching ratios and forward-backward asymmetries （FBAs） of the exclusive decays Bu^＋→π^＋e^＋e^- and Bu^＋ →ρ^＋e^＋e^- （e= e,μ） in the standard model （SM） and the top quark two-Higgs-doublet model （T2HDM）. From the numerical results, we find that the new physics contributions cannot provide very large enhancement to the branching ratios and the theoretical predictions are in good agreement with the SM ones. The T2HDM effects on FBAs of these decays are small. Precision measurements of the dilepton invariant mass distributions, especially in the lower dilepton mass region, and the FBAs in the decays Bu^＋ → π^＋ （ρ^＋ ）e^＋ e^- will greatly help in discriminating among the SM and the new physics models.     

B→0^＋（1^＋）＋ missing energy in unparticle physics

We examine the effects of an unparticle U as a possible source of missing energy in the p-wave decays of a B meson. The dependence of the differential branching ratio on the K0^＊ （K1） - meson＇s energy is discussed in the presence of scalar and vector unparticle operators and significant deviation from the standard model value is found after addition of these operators. Finally, we have shown the dependence of the branching ratio for the above-mentioned decays on the parameters of unparticle stuff like effective couplings, cutoff scale Au and the scale dimensions du.     

2＋1维SU（3）O^＋＋胶球质量

提出变形集团展开法研究２＋１维ＳＵ（３）格点规范场的胶球质量,这种方法采用相边空心图的线性组合作为试探波函数,并引入了Ｗｉｌｓｏｎ圈图的平均值。计算结果表明,变形集团展开的真空能量比普通集团展开法方法的真空能量低,０＾＋＋胶球质量ｍ／ｅ＾２的二阶和三阶结果在耦合常数β＝４．５－８．０区间,表现出较好的标度行为和良好的收敛性。     

过渡金属碳化物CrC^＋,MoC^＋和WC^＋的键离解能研究

首次报道了ＣｒＣ＾＋,ＭｏＣ＾＋和分子离子键离解能。通过测量Ｍ＾＋＋ＸＹ→ＭＸ＾＋＋Ｙ的反应阈值,其中ＸＹ是已知键离解能的双原子分子。可以推出ＭＸ＾＋的键离解能,利用同步辐射真空紫外光电离原理,电离过渡金属羰基化合物Ｍ（ＣＯ）６,从而产生金属离子Ｍ＾＋和金属离子碳化物ＭＣ＾＋,测量Ｍ＾＋和ＭＣ＾＋的出现势,结合已知的ＣＯ分子键离解能Ｄ０（Ｃ－Ｏ）＝１１．０９ｅＶ和图中的关系,可以求得ＭＣ＾＋的键离     

二价Ba2＋、Pb2＋和四价Ti4＋在硼硅酸盐玻璃系统中 对Li＋／Na＋离子交换的影响

本文讨论了在硼硅酸盐玻璃系统中引入二价 Ba2 、Pb2 和四价 Ti4 后 ,由于 Pb2 和Ti4 配位结构的变化 ,引起 Pb2 、Ti4 场强及其与 O2 -离子间距的变化 ,对 Li /Na 离子交换产生影响 ,从而改变折射率差值 (ΔN )和折射率分布 .     

Effects of Yb^3＋ in Er^3＋/Yb^3＋ Codoped Fluorophosphate Glasses

For the Er^3＋ /Yb^3＋ codoped fluorophosphate glasses, Judd-Ofelt theory is used to analyse the influence of YbF3 as not a sensitizer but an average component on the spectroscopic properties around 1530nm emission. The double roles of Yb^3＋, as a sensitizer and as an average component, are discussed. It is found that Yb^3＋ as an average component contributes to the increase of fluorescence lifetime, and Yb^3＋ as a sensitizer has the best sensitization when its concentration is 2.4 mol%.