n.反質(zhì)子

Thus, antiquark, antiproton, etc. 像反夸克，反質(zhì)子等等。

Dirac's theory also predicted a negatively charged sister for the proton, called the antiproton. 狄喇克的理論還預(yù)言有一種質(zhì)子的姐妹粒子，帶負(fù)電荷，叫做反質(zhì)子。

Since 2000 this deceleration has been carried out by the Antiproton Decelerator at CERN. 從2000年開(kāi)始，CERN的反質(zhì)子減速器就在進(jìn)行這樣的減速過(guò)程。

Another team, ASACUSA, is studying exotic helium atoms in which one electron is replaced by an antiproton. 還有另外一個(gè)ASACUSA團(tuán)隊(duì)，則是研究一種奇特的氦原子（反質(zhì)子取代了其中一個(gè)電子）。

That means, in average, there is a extra proton or electron (antiproton) in 19100 neutrons. 也就是說(shuō)，平均在19100個(gè)中子當(dāng)中，要夾帶一個(gè)過(guò)剩質(zhì)子或電子（反質(zhì)子）。

For example, a proton is denoted with a "p", and an antiproton is denoted by a "p" with a line over its top . 舉例來(lái)說(shuō),一個(gè)質(zhì)子用“p”表示,而一個(gè)反質(zhì)子用“p”在它的頂端上加一條線(xiàn)表示。