simultaneously UL
field or mass such as the nucleus
The pair production process is a direct consequence of the mass-energy equation of
Eame, which states that pure energy can be converted into mass and vice versa com
pair annihilation occurs as a result of mass being converted into pure energy. All su
particles also have antiparticles (e.g., antiproton). Even neutral particles have a
for instance, the antineutron is the neutron's antiparticle. Although this text deals
nonrelativistic quantum mechanics, we have included pair production and pair an
which are relativistic processes, merely to illustrate how radiation interacts with me
also to underscore the fact that the quantum theory of Schrodinger and Heisenberg is
nonrelativistic phenomena only.
Example 1.4 (Minimum energy for pair production)
Calculate the minimum energy of a photon so that it converts into an electron-pe
Find the photon's frequency and wavelength
Solution
The minimum energy Emin of a photon required to produce an electron--positron
equal to the sum of rest mass energies of the electron and positron, this correspond
where the kinetic energies of the electron and positron are zero. Equation (1.4)
Answers
Answer:
Pair production, in physics, formation or materialization of two electrons, one negative and the other positive (positron), from a pulse of electromagnetic energy traveling through matter, usually in the vicinity of an atomic nucleus. Pair production is a direct conversion of radiant energy to matter. It is one of the principal ways in which high-energy gamma rays are absorbed in matter. 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 mass m of a single electron is equivalent to 0.51 million electron volts (MeV) of energy E as calculated from the equation formulated by Albert Einstein, E = mc2, in which c is a constant equal to the velocity of light. 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. If pair production occurs in a track detector, such as a cloud chamber, to which a magnetic field is properly applied, the electron and the positron curve away from the point of formation in opposite directions in arcs of equal curvature. In this way pair production was first detected (1933). The positron that is formed quickly disappears by reconversion into photons in the process of annihilation with another electron in matter.
Explanation:
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