Parapositronium, in which the spins of the positron and electron are oppositely directed, decays by annihilation into two photons, with a mean life of about one-tenth of a nanosecond (or 10-10 second; a nanosecond is 10−9 second); and orthopositronium, in which the spins are in the same direction, annihilates into three photons with a mean life of about 100 nanoseconds (10-7 second).
The S parameter evolution with the implantation energy is shown in panel a, while panel b shows the fraction of positrons annihilated into the oxide, the substrate, and into the buried interface as computed by the application of a positron implantation and diffusion algorithm by means of the VEPFIT program [8].
As the F decays (t1/2 = 110 minutes), it produces a positron (E = 250 keV β+), which subsequently annihilates into 2 gamma photons (E = 511 keV γ).
But, he predicted, Australia would fare better in the Rugby World Cup: "England will be annihilated, France, South Africa, Australia and New Zealand into the semi finals.
Touch matter and antimatter together, and it annihilates back into energy.
Bring them together, though, and they will annihilate each other into pure energy.
The Cactus of the Four Winds, a plant so powerful that it could annihilate consciousness, transform body into spirit, crack open the sky".
They also can annihilate each other and disappear into some other form of energy.
Under Russia's latest military doctrine, major combat units are now to be trained and equipped to employ such weapons at the first sign of impending defeat, either to blackmail enemy countries into submission or annihilate them.
