n.正电子，阳电子

A positron is an antiparticle of the electron, with the same mass but opposite charge.
电子的反粒子是正电子，具有相同的质量但电荷相反。
In positron emission tomography (PET), positrons emitted by a radiotracer are used to image biological processes in the body.
在正电子发射断层扫描（PET）中，由放射性示踪剂发出的正电子被用来成像身体内的生物过程。
The decay of a radioactive nucleus can produce a positron, which then annihilates with an electron, releasing gamma photons.
放射性核素衰变时会产生正电子，然后正电子会与一个电子湮灭，释放出伽马光子。
Positronium is a short-lived system consisting of a positron and an electron bound together in an orbit around their common center of mass.
正电子素是一种短寿命的系统，由一个正电子和一个围绕它们共同质心轨道运行的电子组成。
Cosmic rays can generate positrons when they interact with the Earth's atmosphere.
宇宙射线在与地球大气相互作用时会产生正电子。
In particle accelerators, physicists collide positrons with electrons to study fundamental particles and forces.
在粒子加速器中，物理学家使正电子与电子碰撞，以研究基本粒子和力。
The detection of cosmic positrons provides insights into high-energy astrophysical phenomena like supernovae and pulsars.
检测到宇宙中的正电子为了解诸如超新星和脉冲星等高能天体物理学现象提供了线索。
A positron beam can be used for material analysis, such as in positron annihilation spectroscopy.
正电子束可用于材料分析，如在正电子湮没光谱学中。
The existence of positrons was predicted by Paul Dirac's relativistic wave equation before they were experimentally observed.
在正电子被实验观测之前，保罗·狄拉克的相对论波动方程就预言了它们的存在。
The discovery of positrons by Carl Anderson in 1932 provided experimental evidence for antimatter, a cornerstone of modern physics.
卡尔·安德森于1932年发现正电子，为此后反物质这一现代物理学基石提供了实验证据。