Angular Distributions for φ＇ Sequential Decays into 2（π^＋π^-）pp^-γ via XCJ

Amplitudes for φ（2S） sequential decays into 2（π^＋π^-）pp^-γ via XCJ are constructed in effective coupling scheme. A Mote-Carlo simulation is carried out to study angular distributions of the decayed particles in laboratory system. The results can be taken as a reference for measuring the decay of XCJ into at BESⅡ/BEPC in the near future.     

Harmonic Force Fields and Mean Amplitudes For Gallium And Indium Trihalide Monomers

Harmonic force fields (in-plane) for gallium and indium trihalides are developed from complete or incomplete experimental assignments of vibrational frequencies. The missing frequencies are predicted from the calculations Mean amplitudes of vibration are calculated.     

Effect of interdiffusion on electronic states of strain-free Gaussian-shaped double quantum ring superlattice

The effect of interdiffusion on band structure and Bloch amplitudes of three dimensional superlattice composed of Gaussian shaped double quantum rings is investigated using the Fourier transformation to the momentum space. It is shown that the sequence of the principal quasimomentum vectors which correspond to the energy increase depends on superlattice symmetry. Due to interdiffusion both the first and the second minibands of conduction band shift to the region of higher energies and broaden, meanwhile the difference between the behaviors of the dispersion curves in different directions of momentum space gradually disappears. The obtained results indicate to the opportunity of purposeful manipulation of structure characteristics by means of interdiffusion both quantitively and qualitatively.     

Metal Atom Dynamics of Organotin Compounds

Abstract

Temperature-dependent Mössbauer effect spectroscopy has been used to elucidate the dynamics of the metal atom in a number of tin organometallics. The vibrational amplitudes so obtained have been compared to those extracted from single crystal X-ray diffraction data, and the differences between these two sets are rationalized.

GRAPHICAL ABSTRACT     

Phase shift analysis ofππ scattering

A novel approach to energy dependent phase shift analysis ofππ scattering is proposed. Optimised polynomial expansions of Roskies’ amplitudes are given. The parameters of these expansions are searched out by making a fit to the differential cross-sections. Then the transformation matrix between Roskies’ amplitudes and the conventional partial waves is used to compute the phase shifts and inelasticities. Significant improvement is observed in so far as the number of free parameters for a fixed energy phase shift analysis is concerned. Value for the effective Chew-Mandelstam coupling constant, λ_CM, is also estimated.     

Reduction Formula for Fermion Loops and Density Correlations of the 1D Fermi Gas

Fermion N-loops with an arbitrary number of density vertices N>d+1 in d spatial dimensions can be expressed as a linear combination of (d+1)-loops with coefficients that are rational functions of external momentum and energy variables. A theorem on symmetrized products then implies that divergences of single loops for low energy and small momenta cancel each other when loops with permuted external variables are summed. We apply these results to the one-dimensional Fermi gas, where an explicit formula for arbitrary N-loops can be derived. The symmetrized N-loop, which describes the dynamical N-point density correlations of the 1D Fermi gas, does not diverge for low energies and small momenta. We derive the precise scaling behavior of the symmetrized N-loop in various important infrared limits.     

色偏振的理论及应用

本文就色偏振的理论作了详尽的分析。重点分析振幅Ａ１、Ａ２与角φ的关系，区别单色的干涉光与非干涉的白色背景光，得出在色偏振中光强、色纯度、互补色、变色位置和色调变化的规律。同时也对某些应用作了探讨。     

Harmonic Force Field And Mean Amplitudes for Gallium Trichloride Dimer

A harmonic force field is developed and an assignment of the vibrational frequencies for Ga₂Cl₆ is proposed. The mean amplitudes of vibration are calculated.     

Infrared Spectrum of Dihydridobis(ethylenediamine) Osmium Tetrachloro Zincate

The ethylenediamine trmsition metal complexes^1-9 of the type M(en)₂X₂ (M = Co, Ni, Cu, Pd, Pt and × = I, Br, C1, NO³, C10⁴) have infrared spectra of complicated nature which have been used for the study of conformation of the chelate ring. In dihydrldobis ZnC14 ethylenediamlne transition metal complexes, the hydrogen bonding and the presence of ZnCl₄ further complicates the vibrational spectra. With a view to study this, the present study of dihydridobis (ethylenedianlne) osnlum tetrachloro zincate was carried out.     

不变振幅的不同投影选择对核子自能与碰撞截面的影响

本文利用Dirac-Brueckner-Hartree-Fock方法,对不同散射道的核子在核物质中的相互作用进行了细致分析,重点分析了不变振幅的不同投影选择对核物质中核子自能和核子碰撞截面的影响.计算结果显示:1)在确定的核子动量下,自旋三重态所对应的自能总是大于自旋单态的自能;同位旋三重态所对应的自能大于同位旋单态的自能值.2)在完全赝矢(CPV)选择下,不同散射道的核子自能对于动量的依赖均明显弱于在赝标(PS)选择下的相应值,而这种差别主要来自于总角动量J较小的分波态.3)在核子相对动量较小时,两种不同选择所对应的核子微分截面较大.4)在确定的入射能量下,质心系中散射角较小时,不同选择下的微分截面差别较为明显.5)在低入射能区,CPV选择下所对应的微分截面大于PS下的微分截面值.6)在CPV选择下的总截面总是大于PS选择下的总截面值.这些差别均随着随入射能量的增大而消失.