Difference between revisions of "Antiparticle"
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| style="height:20px; width:100px; text-align:center;"|'''[[Conservation of Baryon Number|Baryon Number]]''' | | style="height:20px; width:100px; text-align:center;"|'''[[Conservation of Baryon Number|Baryon Number]]''' | ||
| style="height:20px; width:100px; text-align:center;"|'''[[Conservation of Lepton Number|Lepton Number]]''' | | style="height:20px; width:100px; text-align:center;"|'''[[Conservation of Lepton Number|Lepton Number]]''' | ||
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| style="height:20px; width:120px; text-align:center;"|<math>B=-\frac{1}{3}</math> | | style="height:20px; width:120px; text-align:center;"|<math>B=-\frac{1}{3}</math> | ||
| style="height:20px; width:120px; text-align:center;"|<math>L=0</math> | | style="height:20px; width:120px; text-align:center;"|<math>L=0</math> | ||
| + | |- | ||
| + | | style="height:20px; width:100px; text-align:center;"| | ||
| + | [[Antiproton]] | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>\bar{p}</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>\bar{u}\bar{u}\bar{d}</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>Q=-1</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>S=0</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>B=-1</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>L=0</math> | ||
| + | |- | ||
| + | | style="height:20px; width:100px; text-align:center;"| | ||
| + | [[Antineutron]] | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>\bar{n}</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>\bar{u}\bar{d}\bar{d}</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>Q=0</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>S=0</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>B=-1</math> | ||
| + | | style="height:20px; width:100px; text-align:center;"|<math>L=0</math> | ||
|} | |} | ||
Revision as of 09:59, 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 |
| \(\bar{e}\) or \(\beta^+\) | Fundamental | \(Q=+1\) | \(S=0\) | \(B=0\) | \(L=-1\) | |
| \(\bar{\nu_e}\) | Fundamental | \(Q=0\) | \(S=0\) | \(B=0\) | \(L=-1\) | |
| \(\bar{u}\) | Fundamental? | \(Q=-\frac{2}{3}\) | \(S=0\) | \(B=-\frac{1}{3}\) | \(L=0\) | |
| \(\bar{d}\) | Fundamental? | \(Q=+\frac{1}{3}\) | \(S=0\) | \(B=-\frac{1}{3}\) | \(L=0\) | |
| \(\bar{s}\) | Fundamental? | \(Q=+\frac{1}{3}\) | \(S=+1\) | \(B=-\frac{1}{3}\) | \(L=0\) | |
| \(\bar{p}\) | \(\bar{u}\bar{u}\bar{d}\) | \(Q=-1\) | \(S=0\) | \(B=-1\) | \(L=0\) | |
| \(\bar{n}\) | \(\bar{u}\bar{d}\bar{d}\) | \(Q=0\) | \(S=0\) | \(B=-1\) | \(L=0\) |