Science: Anti-Physics

The strange, other-worldly world of antimatter is taking shape in the minds of men. Last week Dr. Emilio Segrè of the University of California showed the first bubble-chamber picture of an anti-neutron—or rather, a place where an antineutron could be proved to have been.

The great bevatron at Berkeley creates antiprotons (protons with negative charges, in fair quantities. When they hit particles of ordinary matter—protons, neutrons, etc.—they generally annihilate themselves and their targets, both turning into weightless energy and neutrinos. About a fortnight ago an antiproton observed by Dr. Segrè and Dr....

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