杏吧原创

FOR the first time since Einstein said that energy and matter are
interchangeable physicists have created particles out of light.

杏吧原创s from the universities of Stanford, Tennessee, Princeton and
Rochester first used a powerful laser to create an extremely tightly packed beam
of photons. 鈥淭he density of the photons is a thousand times greater than the
number of electrons per cubic centimetre in lead,鈥� says Kirk McDonald of
Princeton, a member of the team.

They then injected a beam of very high energy electrons from a linear
accelerator into the photon beam, slamming some photons backwards into others.
The collisions created electrons and their antimatter
蝉颈产濒颈苍驳蝉鈥攑辞蝉颈迟谤辞苍蝉.

The experiment is reported in Physical Review Letters(vol 79, p
1626).