Nucleosynthesis in Stars (HSC SSCE Physics): Flashcards

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Nucleosynthesis in Stars
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Nucleosynthesis

Fusion of smaller nuclei into larger nuclei

Einstein's mass-energy equation

E=mc2E = mc^2

Mass defect in fusion

Mass difference converted to energy per E=mc2E = mc^2

Fusion up to iron is

Exothermic (releases energy)

PP chain % of Sun's energy

~85%

CNO cycle catalyst

Carbon-12

CNO vs PP chain gamma rays

CNO produces 3, PP produces 2

Helium flash marks transition to

Red giant phase

Elements heavier than iron form in

Supernovas or neutron star collisions

Heavy elements on Earth evidence of

Pre-solar supernovas

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