Science fiction dreams may come true: a small, thin band of stable anti-matter has been discovered near Earth. It was predicted theoretically, but now emissions from the annihilation of these particles has been observed.
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.
I had to laugh my cynical, evil laugh at the BBC report on this discovery, though.
The team says a small number of antiprotons lie between the Van Allen belts of trapped “normal” matter.
The researchers say there may be enough to implement a scheme using antimatter to fuel future spacecraft.
Bwahahahahaha! Space travel? Foolish, optimistic journalists. You know the first use of these things, once the means to harvest and maintain them is found, will be anti-matter bombs.
(Also on Sb)