n.反质子

Thus, antiquark, antiproton, etc. 像反夸克，反质子等等。

Dirac's theory also predicted a negatively charged sister for the proton, called the antiproton. 狄喇克的理论还预言有一种质子的姐妹粒子，带负电荷，叫做反质子。

Since 2000 this deceleration has been carried out by the Antiproton Decelerator at CERN. 从2000年开始，CERN的反质子减速器就在进行这样的减速过程。

Another team, ASACUSA, is studying exotic helium atoms in which one electron is replaced by an antiproton. 还有另外一个ASACUSA团队，则是研究一种奇特的氦原子（反质子取代了其中一个电子）。

That means, in average, there is a extra proton or electron (antiproton) in 19100 neutrons. 也就是说，平均在19100个中子当中，要夹带一个过剩质子或电子（反质子）。

For example, a proton is denoted with a "p", and an antiproton is denoted by a "p" with a line over its top . 举例来说,一个质子用“p”表示,而一个反质子用“p”在它的顶端上加一条线表示。