What is the smallest thing in the world? Chris Bellamy and Max Howells.
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Transcript of What is the smallest thing in the world? Chris Bellamy and Max Howells.
What is the smallest thing in the world?
Chris Bellamy and Max Howells
How small is small A grain of sand - 0.001m
– Size of Earth• Size of the sun
An atom - 0.000 000 001m– Size of this room
A Proton - 0.000 000 000 000 01m– Proton is 1mm across
• 5cm across
A Quark - 0.000 000 000 000 000 01m
– 0.001mm across • 5mm across
The Skittle
Different FlavoursRed YellowPurple
Mix togetherMarshmallows
PinkWhite
The Quark
Different TypesUpDownStrange
Mix togetherHadrons
ProtonsNeutrons
The Quark 3 in a proton
Cannot exist on its own
Different Types
Mix in different combinations
Experiment
Proton - Up Up Down
Neutron - Up Down Down
Harris-on
Up = RedDown = YellowStrange = Purple
- Strange Strange
Unfortunately it can’t exist! Properties must add up to whole values
Charge Number Strangeness
Up 2/3 1/3 0
Down -1/3 1/3 0
Strange -1/3 1/3 -1
The harris-on had a charge of -2/3, Number of 2/3 and strangeness of -2
Any whole number combination can exist
Only protons and neutrons are stable
Max
Quark Anti Quark
The ‘particle’ and the ‘anti particle’ have the same mass,
but all other properties e.g. charge are opposite
The ‘anti photo’ has exactly the same size, but every single
other colour is opposite
Anti Max
If they Collide….
Annihilation, turn into energy
The Up Quark
Mass - 1/3 Charge - -2/3 Nucleon Number - -1/3
The Anti Up Quark
Mass - 2/3Charge - 2/3Nucleon Number - 1/3
What about the Electron?
Lepton
Does not contain quarks
It is fundamental
Like a teaser
Other Particles Quarks mix in any combination,
Proton and Neutron stable
These both contain 3 quarks– The electron has no quarks and is
stable– What if we had 3 anti quarks – Or a quark and an anti quark
Weird NamesFermions
Hadrons Leptons
Baryons Meson Electron
Neutrino
Anti Electron
Anti Neutrino
Quark and Anti Quark
Quarks No Quarks
3 quarks or 3 anti quarks
Proton
Neutron
Lambda Λ0 udsSigma Σ0 udsSigma Σ- dds
They don’t occur naturally
All of those particles except – Proton– Neutron – Electron
• Don’t occur naturally an are unstable
So how do we make them???
How do we make them?
Particles traveling at nearly 300000m/s– Nearly speed of light
Collide
Quarks Fly out
Recombine as new particles
How do we know this?
CERN in Switzerland Large Hadron Collider - 16 miles long
The Large Hadron Collider Particles accelerated by electromagnets
– protons are steered in a circle by magnets.– Faster protons speed, more super conducting magnets required
– Particles collided in the ATLAS Detector
What is ATLAS?
QuickTime™ and a decompressor
are needed to see this picture.
What is ATLAS?
The size of a five story building. Full of Detectors detecting
different properties Located around collision a billion collision events per second twenty simultaneous telephone conversations by
every person on the earth. 1 in 10 million collisions is interesting
Why is ATLAS so good?
Before: Bubble Chamber After: Computer analysis for a billion 3D
collisions every second
How does it all work??
The RGS Human Accelerator Accelerator magnets
Protons
A Detector
QuickTime™ and a decompressor
are needed to see this picture.
What’s The Point
1900 - Marie Curie - Nuclear Radiation– Playing around in a shed
• Cure for cancer• Could solve worlds
energy crisis
Find Out More
http://atlasexperiment.org/
Is this information useful?
For us - No
For the World - No
For the world in 100 years time - Probably
Satisfy our curiosity