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The Mysterious Nucleus

… why some nuclei are stable and others are not. The Mysterious Nucleus. Four Forces…. Gravitation Electromagnetism Weak Nuclear Strong Nuclear. Long range. Short range. leptons. Elementary particles – do not interact via strong force

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The Mysterious Nucleus

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

  2. Four Forces… • Gravitation • Electromagnetism • Weak Nuclear • Strong Nuclear Long range Short range

  3. leptons Elementary particles – do not interact via strong force Come in 6 flavours. Leptons are: electron, electron-neutrino, muon, muon-neutrino, tau, tau-neutrino hadrons 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)‏ quarks u(+2/3)‏ d(-1/3)‏ c(+2/3)‏ s (-1/3)‏ t(+2/3)‏ b (-1/3)‏ What is “stuff” made of?

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

  5. Neutron decay, proton decay and nuclear stability…

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

  7. Using the particle-in-a-box model…

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