LY—1型核子皮带秤

对目前国内外核子皮带秤的技术现状作了全面的比较，并详细阐述了一种新型核子皮带秤的优点及其技术水平，提出了更接近实际的数据处理方法。     

Si_（1－x）Ge_x／Si脊形波导X型分支器的研制

采用分子束外延方法制作低损耗Ｓｉ１－ｘＧｅ／Ｓｉ异质结脊形光波导,在Ｘ型交叉波导上实现了Ｓｉ１－ｘＧｅｘ／Ｓｉ光分支器的功能．设计中采用了ＳｉＧｅ大截面脊形波导的单模条件和交叉波导传输特性分析的结果．Ｘ型光分支器的实现为进一步研制Ｓｉ１－ｘＧｅｘ／Ｓｉ光开关和光电调制器积累了经验．     

The Problem of Gauge Invariance in the Current Study of Nucleon Spin

Instead of the popular gauge-dependent decomposition of the total angular momentum operator in QCD, we derived a gauge-invarian t one with better classical correspondence. We also explored the possibility that the requirement of gauge invariance and classical correspondence wiU partly contradict with the commutation relationship of momentum and angular momentum.     

Nucleon excitations

The mass pattern of nucleon and Δ resonances is compared with predictions based on quark models,the Skyrme model,AdS/QCD,and the conjecture of chiral symmetry restoration.     

Nucleon excitations

The mass pattern of nucleon and Δ resonances is compared with predictions based on quark models,the Skyrme model,AdS/QCD,and the conjecture of chiral symmetry restoration.     

Nucleon deformation

The conjectured deformation of hadrons and its experimental verification offer a particularly fertile ground for understanding the intricate dynamics of their constituents and QCD at the confiment scale. The detailed study of the transition is viewed as the preferred method of experimental investigation of this central issue in hadronic physics. A brief overview of the field is presented, followed by a presentation of the most recent results from Bates program. The new Bates/OOPS data at Q ² = 0.127 GeV/c ²) yield and and they exclude a spherical nucleon and/or . The magnitude and the origin of the deformation is the focus of the ongoing and planned investigations.Received: 30 September 2002, Published online: 22 October 2003PACS: 13.60.Le Meson production - 13.88. + e Polarization in interactions and scattering - 13.40.Gp Electromagnetic form factors - 14.20.Gk Baryon resonances with S = 0C.N. Papanicolas: Invited plenary talk     

Experimental Approach to Three Nucleon Forces in Few Nucleon Systems

Recent achievements in three nucleon force study via three nucleon scattering at intermediate energies ${(E/A \approx 100-200 {\rm MeV})}$ are discussed.     

Experimental Approach to Three Nucleon Forces via Few Nucleon Systems

Recent achievements in three nucleon force study via three nucleon scattering at intermediate energies ( ${E \gtrsim 100 \,\,{\rm MeV/nucleon}}$ ) are discussed.     

Nucleon spin structure

The present status of the spin of the nucleon is reviewed. The focus will be on inclusive double-spin asymmetry measurements in electron-nucleon (³He) scattering. Recent results from Jefferson Lab will be presented as well as their impact on the transition regime between hadronic and partonic degrees of freedom in the nucleon spin structure.     

核子自旋结构

简要介绍了夸克的发现、核子的夸克模型 ,详细讨论了夸克模型中核子内夸克自旋结构和极化轻子-核子深度非弹散射测量出的夸克自旋结构中的矛盾 .指出这个矛盾是由于对夸克自旋理解的混淆.最后还讨论了规范不变性和正则量子化两大物理学原则在夸克、电子轨道角动量上出现的矛盾. A simple introduction of the discovery of quark and the constituent quark model of nucleon have been given. The contradiction between the quark spin structure of nucleon of the constituent quark model and the measured one in the polarized deep inelastic lepton nucleon scattering has been explained in detail. It is elucidated that the so called “proton spin crisis” is due to quark spin confusion. The incompatibility between the requirement of gauge invariance and ...