Converse of object

• emit: Beta particle An electron or a positron emitted from the nucleus of an atom during radioactive decay.

• call: The electric charge may be positive, in which case the beta particle is called a positron.

• produce: So we have certain atoms that fall apart and produce positrons, which are promptly annihilated by the first electron they meet.

• discover: It was in observing cosmic rays that Anderson discovered the positron in 1932.

• create: There they would occasionally strike a proton, creating a positron and a neutron.

Adjective modifier

• cold: The next stage is to mix them with about 75 million cold positrons.

• trapped: At a temperature of 4.2 K, the trapped positrons are an ultracold plasma, a frigid collection of charged particles.

• short-lived: The possibility of using ultra-intense lasers to produce commercial amounts of short-lived positron emitting sources for positron emission tomography ( PET ) is discussed.

Modifies a noun

• tomography: Using positron emission tomography, we examined cerebral blood flow changes in human subjects whilst engaged in the visual processing of face stimuli.

• emitter: Such radioactive forms of elements are known as " positron emitters " .

• annihilation: Methods of NDT include radiography, ultrasonic testing and positron annihilation.

• emission: Using positron emission tomography, we examined cerebral blood flow changes in human subjects whilst engaged in the visual processing of face stimuli.

• beam: Restrictions: In the program the positron beam is chosen to be scattered over a large angle.

• particle: The advent of positron emission particle tracking ( PEPT ) has now made this possible.

Noun used with modifier

• electron: The key is that electron positron annihilation produces not one but two gamma rays.

• electron-: For the research to be practical, the B's must first be produced in large numbers in electron- positron collisions.

• energy: The techniques used to produce beams of low energy positrons can also be adapted to create beams of low energy muons.