深度非弹中的介子与双夸克态对R(σL/σT)的贡献

本文讨论深度非弹中R(σ_L/σ_T)值问题. 文中考虑了夸克束缚态自旋为零的介子与双夸克态效应对R(σ_L/σ_T)的贡献, 即R_b.     

冲击载荷下Al2O3陶瓷的动态响应

 通过平面飞片碰撞实验，研究了质量分数为90%的Al₂O₃陶瓷在0～11.0 GPa的动态响应行为，给出了该材料的Hugoniot弹性极限（σ_HEL）、动态屈服强度、高压声速和Hugoniot曲线。结果表明：当冲击应力在σ_HEL≈11.0 GPa的范围内，Al₂O₃陶瓷的塑性区压缩特性表现出较明显的弥散行为；在远低于σ_HEL的应力区，Al₂O₃陶瓷已表现出明显的压缩损伤效应，即出现所谓的破坏波效应。     

15C的中子晕结构研究

实验测量了83A MeV ^14,15C的核反应总截面(σ_R)及¹⁵C产生^14,15C和¹⁴C产生¹³C的动量分布(P_//). 分析得到了¹⁵C产生¹⁴C和¹³C的动量分布半高宽(FWHM)分别为71±9MeV/c和223±28MeV/c, 而¹⁴C产生¹³C的FWHM为195±21MeV/c. 从¹⁵C和¹⁴C产生¹³C的FWHM与Goldhaber模型的预言基本一致. 而¹⁵C产生¹⁴C的FWHM却要比该模型计算小得多. 同时观测到¹⁵C的σ_R比相邻核有反常增加. 在Glauber模型框架中, 对实验测得的P_//和σ_R进行了探讨. P_//和σ_R的分析结果同时显示¹⁵C的最后一个中主要处于s_1/2态, 具有中子晕结构.     

23Al及其邻近丰质子核的奇异结构研究

在RIKEN-RIPS上测量了²³Al等丰质子核素的核反应总截面(σ_R)和平行动量分布(P^//). 观察到了²³Al核反应总截面的增强, 与以前的实验结果相符. 同时得到了²³Al等丰质子核素擦掉一个质子后的P_//. 在Few-body Glauber模型下对实验结果进行了讨论. P_//的宽度显示²³Al基态的外层质子处于d态, 这与g因子测量实验结果一致. 为了同时解释P_//和σ_R的实验测量结果, 我们认为²³Al可能有核芯增大的现象.     

一种实验确定微电子器件灵敏体积的方法

介绍一种实验确定微电子器件单粒子翻转(SEU)灵敏体积(S_V)厚度d的方法.用从低到高不同能量的重离子辐照微电子器件, 测量其SEU截面随离子射程的变化曲线σ_seu(r), 用数学计算从σ_seu(r)和LET(r)函数提取d. 利用测得的d和σ_seu(LET), 经过模型计算可得到更精确的空间SEU率的预言值.     

BEPC储存环磁聚焦结构的改进

本文叙述了BEPC储存环磁聚焦结构改进的原则及主要结果. 减小β_y为0.08m, 设计亮度达到2×10³¹cm^－2﹒s^－1; 提高β_x/β_y以减小插入节Q铁孔径并使储存环水平方向色差效应减小; 采用较多Q_F铁强度变量的基体, 得到了较好的消色散和较小的β函数调制, 束流稳定区达到12σ_x×12σ_y×12σ_E; 改善了主冲击磁铁之间的相位, 使之接近180°, 简化了注入凸轨系统; 在色散较大的位置上提供了四个安放发射度控制扭摆磁铁的长直线节, 在消色散区附近提供了安放同步辐射扭摆磁铁. 改进后的方案, 有利于提高低能对撞时的亮度及寄生模式和专用模式下的同步辐射应用, 以满足一机两用的要求.     

在大横动量直接光子出射过程中检验强子的胶子分布函数

本文探讨了强作用中截面差Δ_AB=dσ(AB→cγX)-dσ(AB→cγX)的物理含义, 给出了挑选对截面差有贡献的子过程的简单规则. 并建议在大横动量直接光子出射的条件下, 通过测量截面差及其组合检验强子的胶子分布函数. 同时, 还得到了这些截面组合一相应质子、中子、π介子和K介子中的胶子分布函数之间的简单关系:G_p(x)/(Δ_pp－Δ_pp)=G_n(x)/(Δ_np－Δ_np)=G_π(x)/(Δ_π+p－Δ_π－p)=G_K(x)/(Δ_K+p－Δ_K－p),它们可望在实验上得到检验.     

一些高Tc超导体的弹性性质

 本文用超声相比较方法测定了高T_c超导体La_1.85Sr_0.15CuO₄，La₂CuO₄和YBa₂Cu₃O₇的纵波和横波声速，进而导出了它们的纵向模量、切变模量、杨氏模量、泊松比、德拜温度及定体比热。在La_1.85Sr_0.15CuO₄样品上，还进行了压力实验，发现所有弹性模量都是随压强增加而增加。定体比热c_V和泊松比σ在高压下则略有下降。德拜温度是随压强增加而增加的。     

e-p深度非弹性散射中粲夸克态的效应

本文利用质子存在粲夸克态│uudcc〉, 将它的效应和原有的Buras等人计算的结果迭加起来, 能够使e-p深度非弹性散射中所预言的纵横虚光子吸收截面比R=σ_L/σ_T与实验值较好地符合.     

e+e-对撞中夸克喷注强子化的多重数结构

本文半唯象地基于无规独立产生子夸克和相空间考虑的简单图象,计算了S^1/2～4—7GeV能区的夸克喷注强子化的强子纵动量和能量分布S/β dσ/dx_p和S/β dσ/dx_E行为。它们与实验符合得相当好,本文还给出喷注中两个粒子关联截面dσ/(dx_1Edx_2E),有待实验检验。     

THE COLLECTIVE MOTION OF THE BAG AND THE NUCLEON STRUCTURE FUNCTIONS

Using the hypothesis of the bag-quarks' wave-function with the property of transla-tion invariance, and introducing a Lorentz-invariant effective Lagrangian, we have cal-culated the nucleon deep -inelastic structure functions In our calculation the4-momentum conservation is satisfied automatically, while the resultant structurefunctions are positive-definite and vanish when x>1. Furthermore, using the assumptionof the asymptotic freedom, we obtain explicitly the Bjorken scaling, the approximateexpession F₁ (x～1)∝(1--x)⁴, and by the way, a new counting rule Computercalculation gives the F₂(x) curve which seems to be consistent with the data in therange of 0.4<x<1.     

THE ENERGY DEPENDENCE OF THE CONDENSATION PROBABILITY IN THE COMPLEX PARTICLE EMISSION PROBABILITY

The condensation probability γ_β is studied by assuming that γ_β=γ_β(A, E)[ε_β/MeV]^χ When χ=0.425, the best agreement between the calculated dσ/dε and the experimental data is obtained for 18 reactions. For the same composite systems, the extracted γ_β(A, E) are nearly the same. When the mass of the composite system increases, the γ_β(A, E) increases too. For the α-decay nucleus ²¹⁰Po, γ_β(A, E) is larger than the others considerably.     

函数的H-导数和分形动力学

 给出了函数的Hausdorff测度与H-导数。从而，为开展自给的分形动力学提供了解析的数学工具。同时，给出了分形动力学的演化方程组并做了初步讨论与分析。     

THE SPECTROSCOPY OF FOUR-BARYON SYSTEM

In this paper, using SU(6) symmetry theory four-baryon system is discussed and a method of analyzing experimental spectra is provided. Because of the gound states of _ΛΛ⁴H, _ΛΛ⁴He_{, Λ}⁴He and ⁴He are in the same I. R. of SU(6), on can derives masses for _ΛΛ⁴H, _ΛΛ⁴He from the experimental data of _Λ⁴H, _Λ⁴He, and ⁴He. Calculation shows that these J^π=0⁺ double Λ hypernuclei _ΛΛ⁴H, _ΛΛ⁴He are not likely bound states.     

THE BEHAVIOR OF THE PHASE-SHIFT IN THE BAKAMJIAN-THOMAS THEORY

The behavior of the phase-shift of the Bakamjian-Thomas theory and its relationwith the phenomenological nuclear force V=V_RiV_I at high energy are explored.Two limits are obtained:It is found that the repulsive core with a sharp outer edge may induce a characteris-tic oscillation of Re δ₁,and Im δ₁ is sensitive to V₁.The conclusion is that the analy-sis of the phase-shift extending to higher energy is relevant in determining therepulsive core and the imaginary part of the nuclear force.     

THE IRREDUCIBLE REPRESENTATIONS AND THEIR OCCUPATION NUMBER IN DIRECT MULTIPLICATION OF IRREDUCIBLE REPRESENTATIONS OF SU3 GROUP

In this paper, the C-G series of SU₃ group is studied using Racah-Speier theorem. A general formula which can be used to calculate irreducible representations and their occupation number in C-G series of SU₃ group is derived. The general formula is very straight forward and effective for actual calculation One can apply the formula to analyse the distribution rule of occupation number in C-G series of SU₃ group and to define the null space of Winger operator of SU₃ group, the latter is important to the calculation of Wigner coefficients when there is a multiplicity.     

A METHOD OF DATA ANALYSIS OF THE MAGNETIC SPECTROMETER

A method of data analysis of the magnetic spectrometer with heavy ion is discussed. The determination of the charge state, the atomic number, the atomic mass and the energy of reaction products are described. The paper also deals with the soft ware correction of B_ρ non-linear dispersion, kinematic and the difference of flight path.     

合成金刚石与合成体系之关系

 通过各种材料的试验和压机设备因素的测定，总结了金刚石生长过程的特性：金刚石晶体是在石墨（G）-触媒（Me）界面上生长；因电阻R_(G)>R_(Me)、温度T_(G)>T_(Me)以及与外界热交换等原因，使合成腔内产生压力、温度梯度，成为金刚石生长之驱动力。梯度过大过小对金刚石生长均不利；金刚石晶体在G-Me界面两侧是非对称性生长；每个晶粒表面有一特殊结构约20 μm左右厚的金属薄膜，它起到运载碳源和催化的双重作用。要合成粗粒高强金刚石，需要有一个稳定的合成体系。本文分析了该体系状态的性质及稳定的必要性与稳定的具体方法。     

高压对复合氧化物纳米固体内部缺陷结构的影响

 详细研究了不同压力下压制的NiFe₂O₄纳米固体材料的正电子寿命谱，分析了材料内部界面上缺陷结构随压制压力的变化，并与La_0.7Sr_0.3MnO₃纳米固体的缺陷结构随压力的变化进行了比较。实验结果表明，随着压制压力的增加，NiFe₂O₄纳米固体内部界面上自由体积缺陷和微孔隙缺陷的体积均被明显地压缩了，但自由体积缺陷的压缩幅度要高得多，反映出NiFe₂O₄纳米固体界面上原子排列的有序程度在高压下逐渐增强的规律。对具有不同微结构变化特征的复合氧化物纳米固体材料，其内部的缺陷结构在高压下具有不同的变化规律，进而引起其宏观物性的不同变化。     

A DISCUSSION OF THE STRENGTH AND THE RANGE OF THE PHENOMENOLOGICAL NUCLEAR FORCE USING EXPERIMENTAL DATA IN HIGH ENERGY SCATTERING

Under the framework of the Bakamjian-Thomas theory,we discuss the qualitativeproperties of the phenomenological nuclear force V=V_R-iV₁ at high energy arediscussed by a comparision with the small angle scattering data.Because these data inhigh energy are insensitive to the spin,we suppose that the nuclear force at highenergies is spin-independent.The followings are obtained:i)for the Gaussian potential,X₃≌200 MeV and β₃≌0.95 fm,which are thestrength and the range of V₁ respectively;ii)in V_R,there is no hard repulsive core.Under a rough estimation,supposingthe range β₁>0.45 fm,we find the strength of the repulsive force,X₁<480 MeV;iii)all parameters are vary very slowly with energy.