a small particle similar to an electron, but with a positive electric charge

A positron is a small particle similar to an electron, but with a positive electric charge.

Anti-particle to the electron

Anti-particle to the electron - the positron - was discovered in 1932 by C.D. Anderson.

a particle of matter with the same mass as an electron but an opposite charge

positron - A positron is a particle of matter with the same mass as an electron but an opposite charge.

an antiparticle of an electron with identical mass and charge

A positron is an antiparticle of an electron with identical mass and charge.

An electron travelling backwards in time

An electron travelling backwards in time is what we call a positron.

an elementary particle

A positron (also called the positive electron or the antielectron) is an elementary particle; an elementary particleis the antiparticle of the electron.

antiparticle to the electron

The positron, antiparticle to the electron, was discovered by accident in 1932.

A positively charged beta particle

A positively charged beta particle is called a positron.

the antimatter counterpart of the electron

Scientists know that every matter particle has an antimatter partner particle with opposite charge; for instance, the antimatter counterpart of an electron is a positron.

antimatter electron

A positron (antimatter electron) emerges from the reaction and carries away the positive charge originally associated with one of the protons.

a particle exactly like an electron

A positron is a particle exactly like an electron, but with an opposite, positive charge.

particle

The particle, named the positron, is therefore a 'sister-particle' of the electron:

antielectron

For example, the antiparticle of the electron is the antielectron (which is often referred to as positron).

both directions the antimatter counterpart of the electron

And when the electron is moving backwards in time both directions is a positron; the antimatter counterpart of the electron.

positive electron

In 1932 American physicist Carl D. Anderson discovered the positron, or positive electron, the first known particle of antimatter.

antimatter particles

These positrons—antimatter particles with the same mass as an electron, but with a positive charge—have since puzzled scientists with the cosmic mystery of their origins.

an antielectron (called a positron)

So an antielectron (called a positron) is exactly like an electron but has a positive charge.

tiny particles

Positrons are tiny particles emitted from a radioactive substance administered to the patient.

a proton an electron a neutron a positive electron electromagnetic radiation a helium nucleus c.

A positron is: a proton an electron a neutron a positive electron electromagnetic radiation a helium nucleus c.

these particles that reach Fermi's orbit 350 miles above the Earth

a positron is these particles that reach Fermi's orbit 350 miles above the Earth.