Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Anti-Particles

A-Level Particle Physics Project
by

AK I

on 28 November 2013

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Anti-Particles

Anti-Particles
Positron
The anti-particle of the electron is called Positron.
It has a positive charge of +1
In 1932 it was discovered by Carl David Anderson in cloud-chamber studies of the composition of cosmic rays
Positrons emitted from man-made radioactive sources are used in medical diagnosis in the technique known as positron emission tomography (PET)
The Positron also has its own neutrino called anti-electron neutrino.

Anti-Particles (n)
A group of elementary particles that have the same mass and spin as their corresponding particles but have opposite values for all other non-zero quantum numbers. When a particle collides with its antiparticle, mutual annihilation occurs and energy is given off.

- Collins English Dictionary
Hadrons
Hadrons are particles that interact by the strong nuclear force and are made up of 2- 3 quarks.
Baryons (and Anti-Baryons) are made up of three quarks
Mesons are composed of a quarks-antiquarks pair
They are made up of 3 antiquarks
The most common are the anti-proton and the anti-neutron
Anti-Baryons
Charge Conjugation
An anti-particle and the opposite particle are related by charge conjugation.
This means that all quantum numbers, such as charge, baryon number and lepton number are inverted.
Sources
http://hyperphysics.phy-astr.gsu.edu/hbase/particles/hadron.html
http://www.science.uwaterloo.ca/~cchieh/cact/nuctek/particleanti.html
http://www.britannica.com/EBchecked/topic/471904/positron
Anti-Muon
The anti-particle of a Muon is called anti-muon.
It has a electric charge of +1 (just like the positron)
It also has a neutrino called anti-muon neutrino.
Anti-Tau
The anti-particle of a Tau particle is called Anti-Tau (very creative I know..right)
It has a electric charge of +1
It also has a neutrino called... anti-tau neutrino
(surprise, surprise)
Mesons are intermediate mass particles which are made up of a quark-antiquark pair.
These mostly exist for a small fraction of a second as the quark/ anti-quark combination annihilate each other after that very short period of time, giving of energy.
Mesons
Just like there are 6 quarks (or 3 pairs), there are 6 anti-quarks.
Anti-Up and Anti-Down quarks
Anti-Charm and Anti-Strange quarks
Anti-Top and Anti-Bottom quarks
Anti-Quarks
They are seen as the elementary particles, just like the Leptons, Quarks and Anti-Quarks.
All the Anti-Leptons have a Lepton number of -1.
Anti-Leptons
Anti-Particles in Reactions
During some reactions anti-particles are given off, along with some "normal" particles like electrons.
Beta Decay
There are two types:
Beta-Plus Decay - here Positrons can be emitted when a proton-rich radioactive nuclei decays
Beta-Minus Decay - here both an a electron and a anti-electron neutrino are given off.
Full transcript