What is the minimum energy of a photon that can produce an electron-positron pair?

1.02 MeV
To produce two electrons, therefore, the photon energy must be at least 1.02 MeV. Photon energy in excess of this amount, when pair production occurs, is converted into motion of the electron-positron pair.

What produces an electron and positron?

§ 94 Pair production by a photon in the field of a nucleus. The formation of an electron-positron pair in a collision between a photon and a nucleus (Z + γ → Z + e− + e+) and electron–nucleus bremsstrahlung (Z + e− → Z + e− + γ) are two cross-channels of the same reaction.

What is the mass of electron and positron?

The mass of positron is equal to the mass of electron i.e., 0.000548756 amu. The exact value of the mass of the positron is about 0.511 MeV/c2 or 9.11 x 10-31 kg.

Do electron and positron have same mass?

The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. It has an electric charge of +1 e, a spin of 1/2 (the same as the electron), and the same mass as an electron.

Can an electron turn into a positron?

No, electron does not turn into positron due to change of the reference frame. The wave function sign changes, but it is not the electron charge.

How positron is produced?

Positrons are the antiparticles of electrons. The major difference from electrons is their positive charge. Positrons are formed during decay of nuclides that have an excess of protons in their nucleus compared to the number of neutrons. When decaying takes place, these radionuclides emit a positron and a neutrino.

What is produced when an electron and a positron annihilate each other?

In particle physics, annihilation is the process that occurs when a subatomic particle collides with its respective antiparticle to produce other particles, such as an electron colliding with a positron to produce two photons.

What is produced when a positron and a high energy electron collide?

When an electron and positron (antielectron) collide at high energy, they can annihilate to produce charm quarks which then produce D+ and D- mesons.

How are positrons produced?

Positrons are emitted in the positive beta decay of proton-rich (neutron-deficient) radioactive nuclei and are formed in pair production, in which the energy of a gamma ray in the field of a nucleus is converted into an electron-positron pair.