What is the opposite of pair production?

The opposite of Pair Production is Annihilation. When a particle meets its equivalent anti particle (eg. an electron colliding with a positron) the two, having exact opposite charges are automatically destroyed.

What will happen to the positron produced by pair production?

For pair production to occur, the electromagnetic energy, in a discrete quantity called a photon, must be at least equivalent to the mass of two electrons. The positron that is formed quickly disappears by reconversion into photons in the process of annihilation with another electron in matter.

Why two γ ray photons are produced during the annihilation of an electron-positron pair?

For photon energies above the threshold, a photon has more than enough energy to create a particle pair and the surplus energy appears as kinetic energy of the two particles. The positrons enter the solid as a beam of particles produced by a particle accelerator.

Why do positrons and electrons spiral inwards?

When a high-energy photon—which has no charge—interacts with a charged particle, the interaction can produce a pair of oppositely charged particles. This usually results in an electron-positron pair, a V-shaped trail in which each end of the V spins off in an opposite direction and spirals inward.

When a positron and an electron combine they produce?

Annihilation. The interaction between a positron and electron and the conversion of their mass into two photons of 0.51 MeV energy. where a positron, e+, and electron, e−, combine to form two gamma-ray photons of energy Eγ.

What do a positron and an electron form when they combine?

Why can’t electron-positron pair production process occur in vacuum?

Originally Answered: why does pair production cannot occur in vacuum? Because the pair production is a concept of conservation of energy and momentum. But in vacuum we can’t conserv it . In vaccum we don’t want any any type of KE energy to move in the absent of the air.

Why can’t electron positron pair production process occur in vacuum?

Why does a positron and an electron curve in opposite directions?

A: They curve in opposite direction because they each possess opposite electrostatic charge. An electron is possesses a negative charge and a positron possesses a positive charge. A: By bending in the opposite direction from electron particles, it must have been positively charged.

Why do particles spiral inwards after pair production?

In the case of a particle pair, for example, a pair with greater momentum (or mass) will result in a longer, narrower V shape than a pair with less momentum (or mass). A photon that knocks an electron out of an atom creates a single track that bends to the left and spirals inward.

What happens when a positron and an electron meet?

Electron-Positron Annihilation positron is the anti-particle for the electron. It is the exact opposite ofan electron: opposite charge, opposite spin, etc. (The mass is the same,though.) When a positron meets an electron, both disappear in a burst ofenergy, which comes in the form ofradiation.

What is the spin of the photons produced from 3 electrons?

In this case, 3 photons (or more) are produced. The electrons (and positrons) have 1/2 spin, thus they can annihillate in +1/2, -1/2 or in +1/2, +1/2 configuration. Thus, their summed spin is either 0 or 1. The spin of the photons is 1, also they can have opposite or equal sign, thus their total spin want to sum up to 0 or 2.

Can a single photon decay to an electron-positron pair?

no. a single photon can decay to an electron-positron pair. It must do so however near a nucleus to conserve momentum. 2 gamma-ray reactions may be rare but pair production process dominates gamma-ray reactions as energy increases and also as nearby nucleus increases in mass.

Can a single photon pick up energy from two charged particles?

They will annihilate giving 1MeV of energy, but single photon can’t pick this energy up by itself because it would also have E/c of momentum and starting setup, the two charged particles, had non. You need two photons that move in opposite directions. Share Cite Improve this answer Follow