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45 Terms
MeV/c^2
Rest mass
Electron antiparticle
Positron
proton antiparticle
Antiproton
Neutron antiparticle
antineutron
Electron neutrino antiparticle
Electron antineutrino
Four fundamental interactions
gravity, electromagnetic, weak and strong
Exchange particle for electromagnetic interaction
virtual photon
Weak interaction examples
B- and B+ decay, electron capture and electron-proton collisions
Weak interaction exchange particles
W+ and W- bosons
Diagram used to show interactions of particles
feynman
Group of particles that are subject to the strong force
hadrons
Two classes of hadrons
mesons, baryons (and anti baryons)
Mesons examples
pion, kaon
Baryons (and antibaryons) examples
protons, neutrons (antiproton and antineutron)
Baryon number letter
B
Baryons have a baryon number of
1
Antibaryons have a baryon number of
-1
non-baryons have a baryon number of
0
are baryon numbers conserved or changed in particle ineractions
conserved
the only stable baryon is a
proton
what will all baryons eventually decay into
protons
What do free neutrons decay into
A proton, a B- particle and an electron antineutrino
What do free neutrons decay via
The weak interaction
What is the exchange particle of the SNF between baryons
The pion
What particle decays into pions
A kaon
What are leptons
particles that are subject to the weak interaction
Lepton examples
electron, muon, neutrino (electron and muon types) and their antiparticles
What do muons decay into
electrons
What produces strange particles
the SNF
What force decays strange particles
WNF
Strangeness symbol
S
What particle is made in pairs by the SNF
strange particles
Is strangeness conserved in strong interactions or weak interactions
strong interactions
In weak interactions, strangeness can be changed by what values
-1, 0, 1
during B- decay a ? Quark changes into a ? Quark
during B- decay a d Quark changes into a u Quark
During B+ decay a ? Quark changes into a ? Quark
during B+ decay a u quark changes into a d quark
Gravity exchange particle
Graviton
Electromagnetic range
Infinite
Gravity range
Infinite
SNF range
1×10^-18
WNF range
10 fm ( 1×10^-14)
Electromagnetic exchange time
10^-18
SNF exchange time
10^-23
WNF exchange time
10^-10