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PARTICLES AND ANTIPARTICLES
Every particle has an antiparticle.
An antiparticle has the same mass of its corresponding particle, however it's
opposite in other ways such as charge and direction of spin.
PARTICLE ANTIPARTICLE
Electron (e-) Positron (e+)
Proton (p) Antiproton (p)
Neutrino () Antineutrino ()
ANNIHILATION
When a particle collides with its corresponding antiparticle they will collide
and ANNIHILATE each other. The combined mass of the 2 particles is
converted into energy which appears as a pair of photons of
electromagnetic radiation.
PAIR PRODUCTION
This is the opposite of annihilation. It is where a photon of energy is
converted into two particles (a particle and its antiparticle) after which,
the photon ceases to exist.…read more

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FUNDAMENTAL FORCES
There are four fundamental forces between particles. Forces are due to exchange
particles which pass between the two particles which experience the force.
FORCE ACTION EXCHANGE PARTICLE
Gravity Acts on all particles Graviton
Electromagnetic Acts between all charged particles Photon
(holds them together)
Weak Acts between all particles but on a W+ W- or Z boson
Interaction short range only
Strong Acts between hadrons to hold nuclei Pion (pi meson)
Interaction together…read more

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- DECAY
p A neutron decays to a proton, a -
-
And an antineutrino.
W- Decays via weak interaction
n Ve…read more

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+ DECAY
n A proton changes into a neutron, a
+
+ and a neutrino.
W+ Via weak interaction
p Ve…read more

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ELECTRON CAPTURE
n a proton from the nucleus
V
combines with an orbital electron
W+ to form a neutron and a neutrino.
Via weak interaction
p e-…read more

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