您要查找的是不是：
- Beijing Spectrometer (BES) is an experimental facility of high energy physics on Beijing Electron Positron Collider (BEPC) . 北京谱仪是北京正负电子对撞机上的高能物理实验装置。
- This paper describes the possible radiation sources and their characteristics around 3W1 beamline of Beijing Electron Positron Collider (BEPC). 介绍了北京正负电子对撞机同步辐射实验西厅3W1光束线周围辐射的来源和特点、辐射测量方法及测量结果。
- proton electron positron colliding beams 质子 电子 正电子碰撞束
- large electron positron storage ring 大型电子正电子对撞机
- Beijing electron positron collider(BEPC) 北京正负电子对撞机
- Beam-beam deflection effect in Beijing electron positron collider 北京正负电子对撞机中的束束作用偏转效应
- An electron with a negative charge, as contrasted with a positron. 电子带有负电荷，与正电荷相反的电子
- To participate in annihilation, as do an electron and a positron. 湮灭，湮没湮灭，如电子与正电子
- The transmitter was pulsed by an electron tube. 电子管使发射器产生脉冲波。
- THE EXACT SOLUTION OF DIRAC EQUATION UNDER A CONSTANT UNIFORM ELECTRIC FIELD AND THE ELECTRON POSITRON PAIR CREATION RATE IN VACUUM 均匀电场中Dirac方程的严格解和真空中正负电子对的产生率
- To participate in annihilation,as do an electron and a positron. 湮灭，湮没湮灭，如电子与正电子
- An electron with a negative charge,as contrasted with a positron. 电子带有负电荷，与正电荷相反的电子
- This creates, as it were, electron and positron shadows. 这样也就有了电子和正电子的阴影。
- An electron tube having a cathode and an anode. 电子二极管有一个阳极和一个阴极的电子管
- Positron is how it was detected by ? 正电子是如何被检测出来的呢？
- The number of electron pairs an atom can share with other atoms. 共用电子对数，共价一个原子与其他原子共用的电子的对数
- The result is that the electron shadow and the positron shadow are separated. 结果将使得电子的阴影和正电子的阴影被分开。
- The antielectron, or positron, was discovered in 1932. 反电子或正电子,是在1932年被发现。
- electron positron collision 电子正电子碰撞
- Attempts to split an electron always fail. 企图分裂电子的尝试总是失败的。
