Physics particle

Usage examples of positron.

FDG Positron Emission Tomography and other neuroimaging devices for suspected dementia.

When a pion, this subatomic particle, decays it becomes an electron and a positron, and they must be in antiparallel spin states so as not to violate conservation of spin angular momentum.

To distinguish the ensuing trajectory of the photon from the previous trajectories of the electron and positron, we follow a traditional physics convention and draw it with a wiggly line.

Within it, quadrillions of quadrillions of positrons came into being and vanished in millionths of a second.

The positronic cannon of the DIED ships were sometimes called Auger guns because of their use of a variation on the Auger effect by which suitably excited atoms emit, instead of electromagnetic radiation or an electron, an antielectron, or positron.

Electrons and positrons, neutrinos and antineutrinos, photons with billion-light-year wavelengths all swirled through the cosmos.

FDG Positron Emission Tomography and other neuroimaging devices for suspected dementia.

And when a proton annihilates an antiproton, it produces a pi-zero meson one-third of the time, and a charged pion, a muon, and a neutrino two-thirds of the time, after which the pions and neutrons promptly break down to electrons and positrons, photons and neutrinos.

Alpha particles should shove them out of the way with equal ease, and if positrons make up the brain paths, shoving them away disrupts the brain paths and inactivates the robots.

This depends on injecting very short-lived and presumably non-hazardous radioisotopes into the bloodstream and then detecting, by means of their emission of positrons, where they are in the brain at times up to half an hour or so after injection.

The universe was a mass of electrons, positrons, neutrons, and photons.

Since electrons and positrons, and all the other particles for that matter, are only harmonics of closed strings, the numbers that were created are essentially random.

The neutrons absorbed the positrons to become protons, and the electrons were drawn off.

He could try other more energetic transmissions, bursts of positrons, muons, gamma rays, or antiprotons that might attract attention to the Bridgehead.

The positrons were channeled by tuned fields and directed at a confined, negative space-charge to produce the sustained annihilations that the process demanded.