Lecture22

Lecture22 - Major Concepts in Physics Lecture 22 Prof Simon...

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PHY102 1 Major Concepts in Physics Lecture 22. Prof Simon Catterall Office 309 Physics, x 5978 [email protected] http://physics/courses/PHY102.08Spring
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PHY102 The nucleus - recap ± Atom composed of small, dense core of protons (charge +1) and neutrons (charge 0) surrounded by cloud of electrons (charge -1) ± Nucleus held together by strong nuclear force (QCD) ± Nuclear energy scales MeV – characterizes energies of allowed levels and binding energy
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PHY102
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PHY102 Fusion ± Most stable (largest binding energy) atomic nucleus is iron A=58, Z=26 ± Smaller nuclei can fuse together to make a more stable nucleus eg in Sun 2 H+ 3 H Æ 4 He+n+ 17.6MeV ± This process cannot occur at room temperature since H must get very close together to overcome electrical repulsion and strong nuclear force to take over
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PHY102 Fusion II ± In general this process of fusing two smaller nuclei to make a larger one continues to generate energy up to iron ± Once most of the stars core is iron cannot liberate any more energy this way – no outward radiation pressure to keep star in equilibrium – collapses under gravity ± Supernova or maybe black hole produced
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PHY102 Fusion III ± Fusion offers the possibility of huge amounts of power without the radioactive by products of fission ± Also very stable – most accidents with fusion
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Lecture22 - Major Concepts in Physics Lecture 22 Prof Simon...

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