Difference between revisions of "Antiparticle"
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| style="height:20px; width:100px; text-align:center;"| | | style="height:20px; width:100px; text-align:center;"| | ||
[[Positron]] | [[Positron]] | ||
| − | | style="height:20px; width:100px; text-align:center;"|<math>\bar{e}</math> or <math>\beta<math> | + | | style="height:20px; width:100px; text-align:center;"|<math>\bar{e}</math> or <math>\beta</math> |
| style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]] | | style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]] | ||
| style="height:20px; width:100px; text-align:center;"|<math>Q=+1</math> | | style="height:20px; width:100px; text-align:center;"|<math>Q=+1</math> | ||
Revision as of 09:47, 19 May 2024
Key Stage 5
Meaning
Antiparticles are small units of antimatter.
About Antiparticles
- Many particles of matter have antimatter counterparts which have the same mass but opposite electrical charge.
- During pair-production a particle and its antiparticle appear.
- When a particle meets its antiparticle they annihilate one another producing a pair of photons.
- Most antiparticles are given the name of their counterpart particle with the addition of the prefix anti. However, the antiparticle counterpart of the electron is known as the positron.
| Antiparticle | Symbol | Composition | Charge/e | Strangeness | Baryon Number | Lepton Number |
| \(\bar{p}\) | \(\bar{u}\bar{u}\bar{d}\) | \(Q=-1\) | \(S=0\) | \(B=-1\) | \(L=0\) | |
| \(\bar{n}\) | \(\bar{u}\bar{d}\bar{d}\) | \(Q=0\) | \(S=0\) | \(B=-1\) | \(L=0\) | |
| \(\bar{e}\) or \(\beta\) | Fundamental | \(Q=+1\) | \(S=0\) | \(B=0\) | \(L=-1\) | |
| \(\bar{/nu_e}\) | Fundamental | \(Q=0\) | \(S=0\) | \(B=0\) | \(L=-1\) |