particle ( LEPTONS AND BARYONS ) Flashcards
what does a koan decay into
pion muon neutrino antineutriono
what does pion decay into
muon antimuon neutrion antineutrino
what does muon decay into
electron anitneutrino
what are baryons made up off
3 quarks
what are meson made up off
anti quark and quark
what is conserved in an interaction
lepton number baryon number and charge
what are antiparticle
they are corresponding particle with same mass and opposite charge
baryon charge for up down and strange
up = 2/3 down = -1/3 strange = -1/3
what does anti muon decay into
positron and neutrino
what are pion and koan
both are mesons
what is conserved
energy momentum and charge are conserved for the decay to happen
what are baryons
anything that decays into a proton example proton and neutron
when is a pion released
when a proton is released
what interaction does hadron go through
strong weak electromagnetic and gravity
what interaction does leptons go through
gravity weak and electromagnetic
example of hadron
pion kaon proton and neutrons
example of lepton
electron and neutrinos
when is strangeness conserved
strong interaction
what role does exchange particle play
they transfer energy and momentum to the other particle
what happens to mass and atomic number in alpha decay
mass number decreases by 4 atomic number decreases by 2 ( atomic number is number of proton)
what happens to atomic and mass number in beta decay
mass number stays the same atomic number decreases by 1
what is udd
neutrons
what interation happens with the w-
weak interaction
state the class of particle that the w- belongs to
bosons
particles that are produced when a muon decays
electro an electron antineutrino and muon neutrino
Describe the interaction that is responsible for keeping protons and neutrons together
in a stable nucleus.
You should include details of the properties of the interaction in your answer
the strong interaction is responsible for keeping them together
has an attraction up to 1 to 5 femtometres and repulsive below 1 and above 5
only affects hadrons so baryons and mesons
Nuclei can decay by alpha decay and by beta decay.
In alpha decay only one particle is emitted but in beta decay there are two emitted
particles.
Explain how baryon number is conserved in alpha and beta decay.
in alpha decay the number of neutrons and protons are unchanged so baryon does not change
where as in beta decay a neutron changes into a proton and both of them have the same baryon number
There have been considerable advances in our understanding of particle physics over
the past 100 years.
Explain why it is necessary for many teams of scientists and engineers to collaborate
in order for these advances to be made.
results and data has to checked by other scientist before they can be accepted
many skills and discipline are required which one team are unlikely to have
particle accelerators are very expensive so working together helps spread the cost out
Which is an exchange particle of the strong nuclear force?
pion
A polonium-210 nucleus is formed when a stationary nucleus of bismuth-210 decays.
A beta-minus (β−
) particle is emitted in this decay.
Outline, with reference to β− decay, why bismuth-210 and polonium-210 have different
proton numbers.
a neutron turns into a proton
proton number increases by 1 so polonium would have one more proton than bismuth
what can use used to detect beta particle
cloud chamber
