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How Cosmic-ray Protons Make Gamma rays

In the simplest and most common interaction, a cosmic-ray proton strikes another proton. The protons survive the collision, but their interaction creates an unstable particle -- a pion -- with only 14 percent the mass of a proton. In 10 millionths of a billionth of a second, the pion decays into a pair of gamma-ray photons. More complex scenarios occur when cosmic-ray protons strike nuclei containing greater numbers of particles.
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Simple animation of proton-proton interaction resulting in netural pion that decays into two gamma rays.    Simple animation of proton-proton interaction resulting in netural pion that decays into two gamma rays.
Duration: 23.0 seconds
Available formats:
  960x540 (29.97 fps) WEBM         1000 KB
  1280x720 (59.94 fps) QT         410 MB
  1280x720 (30 fps) QT         9 MB
  1280x720 (59.94 fps) QT         7 MB
  1280x720 (29.97 fps) MPEG-4   5 MB
  960x720 (29.97 fps) MPEG-4   3 MB
  640x360 (29.97 fps) MPEG-4   1 MB
  320x180 (29.97 fps) MPEG-4   604 KB
  352x240 (29.97 fps) MPEG-1   5 MB
  1280x720   TIFF         2 MB
  320x180     PNG           272 KB
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This animation shows a more dynamic view of the pion and gamma ray creation process.    This animation shows a more dynamic view of the pion and gamma ray creation process.
Duration: 31.0 seconds
Available formats:
  960x540 (29.97 fps) WEBM         7 MB
  1280x720 (59.94 fps) QT         519 MB
  1280x720 (60 fps) Frames
  1280x720 (29.97 fps) MPEG-2   20 MB
  1280x720 (29.97 fps) MPEG-4   18 MB
  1280x720 (30 fps) QT         17 MB
  960x720 (29.97 fps) MPEG-4   17 MB
  1280x720 (59.94 fps) QT         9 MB
  640x360 (29.97 fps) MPEG-4   5 MB
  320x180 (29.97 fps) MPEG-4   2 MB
  352x240 (29.97 fps) MPEG-1   6 MB
  1280x720   TIFF         2 MB
How to play our movies

Short URL to This Page:http://svs.gsfc.nasa.gov/goto?10567
Animation Number:10567
Completed:2010-02-12
Animator:Scott Wiessinger (UMBC) (Lead)
Producer:Scott Wiessinger (UMBC)
Writer:Francis Reddy (SPSYS)
Series:Astrophysics Animations
Please give credit for this item to:
NASA/Goddard Space Flight Center
 
Keywords:
SVS >> Gamma Ray
SVS >> HDTV
SVS >> Astrophysics
SVS >> Universe
SVS >> Fermi
SVS >> Supernova
 
 


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Many of our multimedia items use the GCMD keywords. These keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 8.0.0.0.0

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