Difference between revisions of "Antiparticle"
| (3 intermediate revisions by the same user not shown) | |||
| Line 4: | Line 4: | ||
===About Antiparticles=== | ===About Antiparticles=== | ||
| − | + | *Many [[Subatomic Particle|particle]]s of [[matter]] have [[antimatter]] counterparts which have the same [[mass]] but opposite [[Electrical Charge|electrical charge]]. | |
| − | + | *[[Antiparticle]]s are generally denoted by a bar over the top of the symbol used for their [[matter]] counterpart. | |
| − | + | *During [[Pair-Production|pair-production]] a [[Subatomic Particle|particle]] and its '''antiparticle''' appear. | |
| − | + | *When a [[Subatomic Particle|particle]] meets its '''antiparticle''' they [[Annihilation|annihilate]] one another producing a pair of [[photon]]s. | |
| + | *Most '''antiparticles''' are given the name of their counterpart [[Subatomic Particle|particle]] with the addition of the prefix '''anti'''. However, the '''antiparticle''' counterpart of the [[electron]] is known as the [[positron]]. | ||
| + | *The existence of [[antiparticle]]s is a fundamental concept in [[Particle Physics|particle physics]]. | ||
| + | *[[Antiparticle]]s are produced in high-energy collisions and natural radioactive [[Decay (Physics)|decay]]. | ||
| + | *[[Antiparticle]]s can be trapped and studied using magnetic fields in devices like Penning traps. | ||
| + | *Understanding [[antiparticle]]s helps in exploring the symmetry and interactions of fundamental forces. | ||
| + | *The discovery of [[antiparticle]]s confirmed the predictions of [[Quantum Field Theory|quantum field theory]]. | ||
| Line 18: | Line 24: | ||
| 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]]''' | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
|- | |- | ||
| style="height:20px; width:100px; text-align:center;"| | | style="height:20px; width:100px; text-align:center;"| | ||
| Line 81: | Line 69: | ||
| 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> | ||
|} | |} | ||
Latest revision as of 19:22, 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.
- Antiparticles are generally denoted by a bar over the top of the symbol used for their matter counterpart.
- 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.
- The existence of antiparticles is a fundamental concept in particle physics.
- Antiparticles are produced in high-energy collisions and natural radioactive decay.
- Antiparticles can be trapped and studied using magnetic fields in devices like Penning traps.
- Understanding antiparticles helps in exploring the symmetry and interactions of fundamental forces.
- The discovery of antiparticles confirmed the predictions of quantum field theory.
| 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? | \(Q=+\frac{1}{3}\) | \(S=+1\) | \(B=-\frac{1}{3}\) | \(L=0\) | |
| \(\bar{p}\) | \(\bar{u}\bar{u}\bar{d}\) | \(Q=-1\) | \(S=0\) | \(B=-1\) | \(L=0\) | |
| \(\bar{n}\) | \(\bar{u}\bar{d}\bar{d}\) | \(Q=0\) | \(S=0\) | \(B=-1\) | \(L=0\) |