1 / 7

The Pion

The Pion. CROP: Roncalli Division Timothy Willett Roy Lehn Dwight Johns. Etymology of the Pion (Pi Meson). The Pion is also known as the Pi Meson Among the mesons, the pion (or pi meson) is the lightest The symbol given for the pion is very difficult to remember :.

matana
Download Presentation

The Pion

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Pion CROP: Roncalli Division Timothy Willett Roy Lehn Dwight Johns

  2. Etymology of the Pion (Pi Meson) • The Pion is also known as the Pi Meson • Among the mesons, the pion (or pi meson) is the lightest • The symbol given for the pion is very difficult to remember : <http://www.cecm.sfu.ca/projects/pihex/>

  3. The Prediction of a Particle • In 1935, Hideki Yukawa predicted the presence of a particle that would be “responsible for the force of the strong interactions holding the atomic nucleus together.” www.factmonster.com Hideki Yukawa <http://www.nobel.se/physics/laureates/1949/yukawa-bio.html>

  4. The Discovery of the Pion • 12 years later, in 1947, C. F. Powell detected a particle in cosmic rays which fit Yukawa’s hypothesis • This particle became known as the pion www.factmonster.com Cecil F. Powell (1903-1969) www.siux00.physik.uni-siegen.de

  5. How Did He Do It? • Between 1939 and 1945, Powell developed techniques which utilized photographic emulsions to record the paths of cosmic rays • He exposed plates on the tops of mountains and in high-altitude balloons • His work was able to confirm the existence of this new particle, the pion Encyclopedia Britannica

  6. Mass charged pions have a mass 1/7 of a proton’s mass, which correlates to the mass of 273 electrons neutral pions have 264 electron-masses Charge pions have a positive, negative, or neutral charge the degree of charge on the positive and negative pions is one Life-time Charged pions have a lifetime of about 2.55 x 10-8 seconds Neutral pions have a lifetime of about 10-15 seconds The Characteristics of Pions www.triumf.ca www.factmonster.com

  7. Interactions • Charged pions usually break down into muons and neutrinos • Neutral pions usu. decay into a pair of photons • The neutral pion is its own antiparticle

More Related