| 
  • If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • Finally, you can manage your Google Docs, uploads, and email attachments (plus Dropbox and Slack files) in one convenient place. Claim a free account, and in less than 2 minutes, Dokkio (from the makers of PBworks) can automatically organize your content for you.

View
 

Antimatter 2008

This version was saved 13 years, 4 months ago View current version     Page history
Saved by PBworks
on March 18, 2008 at 4:16:24 pm
 

Antimatter

 

Antimatter by definition is the mirror image of matter. It is equal and opposite. For example, every electron should hypothetically have a positron (an electron with a positive charge) partner. When antimatter and matter collide, they cancel each other out in a process called annihilation. This process produces an immense amount of energy, as well as gamma rays and sometimes more matter. Antimatter collisions have helped us to discover many subatomic fundamental particles.

 

 

Also, whenever matter is created, its antimatter opposite is created as well. This accounts for one of the greatest questions in High Energy Physics: why is there more matter than antimatter? Although we could not exist without this asymmetry, it does not make any sense. However, two theories have been produced in an attempt to explain the lack of antimatter.

 

  1. GUT Baryogenesis: This theory is based on the belief that baryons (protons and neutrons) underwent unusual reactions during the GUT (Grand Unification) stage of the early universe.

 

  1. Electroweak Baryogenesis: This newer theory is based on the belief that, during the Electroweak Phase Transition of the early universe, the hypothetical Higgs molecule aquired its unusual property to have mass in a vacuum. It is believed that antimatter particles were transformed into matter in the same way.

 

Machines have been built to try to produce antimatter in laboratories. So far, antielectrons (positrons), antiprotons, antineutrons, antinuclei, and antihydrogen have all been produced. Antimatter decelerators use penning traps, devices that use magnetic fields to trap antimatter particles for long periods of time. Antihydrogen was formed by forcing a positron to rotate an antiproton.

 

 

History

Here is a timeline of the major breakthroughs in the discovery of antimatter:

 

 

 

 

Sources and Links

http://livefromcern.web.cern.ch/livefromcern/antimatter/

http://en.wikipedia.org/wiki/Antimatter

 

Comments (0)

You don't have permission to comment on this page.