Question

Is it possible for a positron/electron (rest mass = 0.511
MeV/c^{2}) pair to collide with sufficient speed that they
can annihilate and produce a proton/anti-proton (rest mass = 938.27
MeV/c^{2}) pair?

Answer #1

Convert each of the following MeV/c2 masses into
kilograms:
a) The mass of an electron or of a positron is 0.511
MeV/c2
b) The mass of a proton or of a antiprton is 938.3
MeV/c2
c) The mass of a positive pion or of a negative pion (antipion)
is 139.6 MeV/c2

An electron and an antielectron (positron) each have a rest
energy of 0.511 MeV , or approximately 8.2×10-14 J .
When an electron and a positron are both stationary and located
next to each other during an annihilation process, their mass
energy converts to electromagnetic energy released as photons,
electromagnetic particles that have momentum but no mass and that
travel at the speed of light. What is the minimum number of photons
that could be released, and how much energy...

An electron and positron (anti-electron) has rest energy 0.5
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A) What is the total energy of the two
particles?
B) What is their Kinetic energy at that speed?
C) What is the momentum of the two particles?
D) What is the rest mass of the new particle discovered?

It is possible for an electron and positron (an anti-electron)
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Two pions (mass of 139.6 MeV/c2) traveling at the same speed
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In a head-on collision of an electron of kinetic energy of 2.044
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An electron has a kinetic energy K of 1 MeV and is incident on a
proton at rest in the laboratory. Calculate the speed of the CMS
frame (The centre of mass, or centre of momentum, (CMS) frame is
that in which the sum of the momenta (i.e., the total momentum) of
all particles is zero) moving relative to the laboratory.
(a) Express the initial energies Ee, Ep and initial momenta pe,
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An electron and a positron (an anti-matter electron) meet and
completely annihilate, creating two photons of identical energy.
What is the energy of each photon created?
Note: the positron has exactly the same mass as the
electron.
about 512 eV
about 5 eV
about 0.51 MeV
about 5.1 MeV

In Quantum Mechanics there's an interesting phenomenon where an
electron and a positron collide. Since these are antiparticles of
each other, when they collide they annihilate and produce two equal
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A muon is an elementary particle that resembles a heavy
electron. It has a rest mass of 105.7 MeV/c2 compared to
the electron rest mass of 0.511 MeV/c2. In frame, S, the
muon has a velocity of 0.85 c ms?1 . In frame, S', the
muon is found to have a velocity of 0.65 c
ms?1 .
The muon velocity vectors in either frame and the velocity of
relative motion of frame S and S' are all parallel to the...

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