The Mysterious Nucleus

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Presentation transcript:

The Mysterious Nucleus … why some nuclei are stable and others are not

Four Forces… Gravitation Electromagnetism Weak Nuclear Strong Nuclear Long range Short range

What is “stuff” made of? b (-1/3)‏ s (-1/3)‏ d(-1/3)‏ c(+2/3)‏ t(+2/3)‏ Hadrons can interact via all forces and are composed of quarks. Examples: baryons are 3-quark combinations, mesons are 2-quark combos (example: neutron is udd)‏ hadrons u(+2/3)‏ quarks Elementary particles – do not interact via strong force Come in 6 flavours. Leptons are: electron, electron- neutrino, muon, muon-neutrino, tau, tau-neutrino leptons

Neutrons don't live long in the wild! udd uud e p n W- n The weak interaction converts a neutron down-quark into an up quark

Neutron decay, proton decay and nuclear stability…

How to Build a Nucleus Strong interaction Electrostatic repulsion “quantum crowding” – Asymmetry

Using the particle-in-a-box model…

Calculating Binding Energy EB Increase Stability Surface area Volume Charge Asymmetry

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