thespike at satx.rr.com
Sat Sep 15 19:32:55 UTC 2007
<< In free space, two atoms of positronium cannot combine together,
because they have such excess energy that they simply fly apart
again. Writing in the British journal Nature today, University of
California Riverside physicists David Cassidy and Allen Mills
describe how they overcame this obstacle to forge the world's first
Ps2 in laboratory conditions.
They did it by first creating a special trap that confined some 20
million positrons, which were then focussed in a nano-second blast
onto the surface of porous silica.
Holed up within the pores, the positrons captured electrons to form
atoms of positronium, which in turn linked up to form around 100,000
two-atom molecules before annilation.
The silica walls of the pores were the key to the success, as they
absorbed the excess energy of the atoms, allowing them to wed, albeit
fleetingly. Evidence that the long-sought molecules had been created,
comes from a tell-tale temperature curve of gamma rays released by
I wonder if those silica walls could be termed... positronic branes.
More information about the extropy-chat