particle interactions Flashcards
What type of interaction can only hadrons undergo
-the strong interaction
what type of interaction are strange particles such as kaons produced through
-the weak interaction
what do advancements in particle physics rely on?
collaborative efforts of large teams of scientists and engineers to validate new knowledge through peer review or use of particle accelerators
why is there a minimum energy in pair production?
as the energy of the photon needs to provide the rest masses of particles
state the products of the decay of an anti down quark
anti up–quark plus positron plus electron neutrino
state two properties of strange particles
usually produced in pairs
contains at least one strange quark
usually decays via the weak interaction
What is an antiparticle
Antiparticle for every particle type
They have equal rest mass
Equal and opposite charge if charged
what are the three decays for a kaon
pions
muon and antineutrino
antimuon and neutrino
what are the two decays for a charged pion
muon and antineutrino
anitmuon and neutrino
what is the decay for a neutral pion
high energy photons
what is the decay for a muon
electron and antineutrino
what is the decay for an antimuon
positron and neutrino
what is conserved in particle interactions
momentum energy lepton and baryon numbers charge strangeness
what is a photon
a packet of electromagnetic waves
what is an isotope
a particle with the same proton number but a different number of neutrons
what is the strong nuclear force
the force that holds the nucleons in a nucleus together
it overcomes the electrostatic force of repulsion between protons
what are the key points about the strong nuclear force
range no more than 3-4 fm
attractive force at 3-4 fm down to 0.5 fm seperations smaller than that it is repulsive
same effect on two protons than on two neutrons and a proton and a neutron
what is annhilation
the process that occurs when a particle and anti particle meet and interact
two photons are produced in this process
what is pair production
the process of when a photon creates a particle and it’s corresponding anti particle
what is a hadron
particles and antiparticles that can interact through the strong interaction
what is a lepton
particles and antiparticles that can’t interact through the strong interaction
through what type of interaction to hadrons decay through
hadrons except for the proton decay via the weak interaction
what are the two sub groups of hadrons
Baryons and mesons
what are baryons
protons and all other hadrons that decay into protons either directly or indirectly
what are mesons
hadrons that do not include protons in their decay products
why were neutrinos hypothesised
to account for the energy that was not conserved in beta minus decay
as energy levels before and after the decay did not show energy was conserved
what is the purpose of exchange particles
to carry energy and momentum between the particles experiencing the force
