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You probably didn’t wake up this morning wondering what happens to the antiprotons that must be created by the collision of cosmic rays with the upper atmosphere. But if you are one of the few who loses sleep over the fact that these antiprotons should be somewhere out there but have yet to be directly detected, we are happy to report that you can rest easy: Astrophysicists have finally found them trapped in an antiproton belt around the Earth.
Enter PAMELA, a low Earth orbiting spacecraft launched in 2006 to seek out antiprotons in cosmic rays. Each day PAMELA makes a pass through the South Atlantic Anomaly, the part of the Van Allen Belts that come closest to the Earth and a sort of tide pool for energetic particles. If the antiprotons are collecting anywhere, they ought to be here.
And now, after analyzing 850 days of data, it turns out they are. PAMELA tracked down exactly 28 of them, which is actually way more than one might expect to find blowing in the solar wind. In other words, antiprotons are being captured and stored there. Solid scientific theory (and high-tech orbiting hardware) wins again.
The Earth is constantly bombarded by high energy particles called cosmic rays. These are generated by the Sun and by other sources further afield. (The source of the highest energy cosmic rays is still a mystery).
The particles are generally protons, electrons and helium nuclei and when they collide with nuclei in the Earth's upper atmosphere they can produce showers of daughter particles. These showers can be so extensive that they can easily be observed from the ground.
Astronomers long ago realised that these collisions must produce antiprotons, just as they do in particle accelerators on Earth. But this raises an interesting question: what happens to the antiprotons after they are created?
Clearly, many of these antiparticles must be annihilated when they meet particles of ordinary matter. But some astronomers always suspected that the remaining antiprotons must become trapped by the Earth's magnetic field, forming an antiproton radiation belt.
The existence of a significant flux of antiprotons confined to Earth's magnetosphere has been considered in several theoretical works. These antiparticles are produced in nuclear interactions of energetic cosmic rays with the terrestrial atmosphere and accumulate in the geomagnetic field at altitudes of several hundred kilometers. A contribution from the decay of albedo antineutrons has been hypothesized in analogy to proton production by neutron decay, which constitutes the main source of trapped protons at energies above some tens of MeV. This Letter reports the discovery of an antiproton radiation belt around the Earth. The trapped antiproton energy spectrum in the South Atlantic Anomaly (SAA) region has been measured by the PAMELA experiment for the kinetic energy range 60--750 MeV. A measurement of the atmospheric sub-cutoff antiproton spectrum outside the radiation belts is also reported. PAMELA data show that the magnetospheric antiproton flux in the SAA exceeds the cosmic-ray antiproton flux by three orders of magnitude at the present solar minimum, and exceeds the sub-cutoff antiproton flux outside radiation belts by four orders of magnitude, constituting the most abundant source of antiprotons near the Earth.
Lies, anti matter can only be detected in hadron colliders at this point in time. Anti-matter was only recently discovered to actually exist just a few months ago. Anyone can upload a graph and say "this line means its anti-matter" doesnt mean its true.
Originally posted by lonewolf19792000
Lies, anti matter can only be detected in hadron colliders at this point in time. Anti-matter was only recently discovered to actually exist just a few months ago. Anyone can upload a graph and say "this line means its anti-matter" doesnt mean its true.
Scientists picked up on the never-before-seen phenomenon by peering at thunderstorms with NASA's Fermi Gamma-ray Space Telescope. The antimatter particles were likely created by what scientists call a terrestrial gamma-ray flash (TGF), a brief burst of gamma rays produced inside thunderstorms and known to be associated with lightning, researchers said.
"These signals are the first direct evidence that thunderstorms make antimatter particle beams," study lead author Michael Briggs, of the University of Alabama in Huntsville, said in a statement. Briggs presented his team's results here today (Jan. 10) at the 217th meeting of the American Astronomical Society in Seattle.