Pair production.
pair production is a
process in which photons or energy is converted into matter.
when a photon or
gamma ray having energy, greater than one
point zero two electron volt passes near
a nucleus it is converted into an
electron and positron. No conservation
principle is violated during this
process. According law of conservation of charges the
sum of all the charges must be conserved
similarly in this process the photons
have no charge where the positron have
positive charge and electron have
negative charge and the sum of positron
and electron charge is equal to the
charge of photons. so it obey
conservation of charges.
For the law of
conservation of energy we know that the
sum of all energies in this process must
be conserved so if electrons have energy
zero point five one mega electron volt
where positrons have energy zero point
five one mega electron volt the sum of
electron and positron energy is equal to
one point zero two electron volt in
order to satisfy the law of conservation of
energy the incident photon or gamma
rays must have energy greater than one
point zero two electron volt. Pair
production does not occur in free space
because we must have something to carry
away the momentum to satisfy the law of
conservation of momentum
linear momentum is conserved with the
help of this nucleus. the reverse process
of pure production is pair inhalation in
which the positron and electron combines
can result in photons
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