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Antimatter and matter don't always go bang

点击量:   时间:2019-03-14 10:11:01

By Edwin Cartlidge FIRE antimatter at matter and you would expect to see some spectacular fireworks. But not always, it seems. Sometimes, antimatter can bounce off matter, casting doubt on the long-held notion that a collision between matter and antimatter always makes for an explosive annihilation. In 2004, Evandro Lodi Rizzini of Brescia University in Italy and colleagues reported the results of an experiment using a beam of antiprotons created by the Low Energy Antiproton Ring at CERN, near Geneva, Switzerland. They fired the antiprotons into a long aluminium cylinder filled with either hydrogen, deuterium or helium gas. The antiprotons,