Lecture notes
2.1 The Particle Zoo (AQA Physics)
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- AQA
A one-page summary of section 2.1 ‘The Particle Zoo’ from the AQA A-Level Physics textbook.
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TITHE PARTICLE 200COSMIC 19 YS
whencosmicrays enter Earth's atmosphere create short livedparticles
antiparticles photons
rayswere FAST MOVING
further investigations showedmost cosmic
PROTONS NUCLEI i
collide with G.A.S.A.IO'M.S showers of ftp.TICLES
AN.TLPARTICLES
Izzy
Iaff9YIesat7 anffi ftp.Ed
s .is a short lived
Thy
MUONS PIONS A A ONS
MUON pl ON KAON
Heavy electron a or Jl MESON HMESON
a
T.rs or
NEGATIVELY
CHARGED
µ
I a can be POSITIVE
Ttt NEGATIVE
I can be POSITIVE
Ht NEGATIVE
Ti or NEUTRAL TW K or NEUTRAL KO
17.70 over 200 17.70 of
L TI L PROTON JIL H L PROTON
ELECTRON 17.70
µ 17.7cg
DISCOVERY DISCOVERY B DISCOVERY
CloudChamber photographs Powell discovered Cloud Chamber photographs
by Anderson showed particles by using revealed existence of
unusual track that EiE Short lived particles
could'vebeen tiny MICROSCOPIC f
produced
by such TRACKS foundin CECIL Produced in 2 s through
a particle photographicemulsion POWELL
cap
ANDERSON
STRONG INTERACTION
exposed to cosmicrays
when PROTONS at high
But TRACKLENGTH 40mm at HIGHALTITUDE Speed crash into NUCLEI
indicated Lasted longer than
yyt go and travel far beyond
STRONGLY INTERACTING original nucleus
particle should a Yukawapredictedexistence one
of exchange particles LONGER DECAY includes
furtherinvestigations
electron
Heavy
forSprongNUCLEAR Tl as product decay via
thought range
6 WEAK INTERACTION
decays through WEAK µ EH be called
leading them to
INTERACTION 10 m YUKAWA
STRANGEPARTICLES
mass ELECTRON X C PROTON
µ µ Limestones f ko k't H e.EE
as I as a
y
s
u
x or to n
y PIONS t
I
o s t t o ANTIMVON µ
w T HIGHENERGYPHOTONS Js w
a
a 8 w
D NEUTRINO V
a
ELECTRON e pospppn.ON.net
MUON H ANTIMVON µt MUON µ
ANTINEUTRINO J NEUTRINO V ANTINEUTRINO J
ANTINEUTRINO J NEUTRINO
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