The first measurement of the interaction between antiprotons - the antimatter equivalent of protons - has been completed by an international team of physicists working at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory in New York.
Italian researchers using data from the satellite PAMELA have proven that theories showing there ought to be a ring of antiprotons encircling the Earth due to cosmic rays colliding with nuclei in the upper atmosphere are correct. Piergiorgio Picozza from the University of Rome, Tor Vergata, and a host of colleagues have published the results of their findings in arXiv.
