Lecture_38

Lecture_38 - PHYS 342 Fall 2011 Lecture 38: Nuclear...

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PHYS 342 Fall 2011 Lecture 38: Nuclear Stability and Decay Ron Reifenberger irck Nanotechnology Center Birck Nanotechnology Center Purdue University 1 Lecture 38/39
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What does it mean? The nuclear potential energy of two nucleons vs. separation ner y Energy (MeV) ~0.4fm radial separation, r 2.2 MeV ~20 MeV In 3-d, ALL the nucleons are acked into a ~2 fm packed into a sphere of radius 1 3 o R RA R R2 fm 2 pn
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Systematic study of binding energy (B) vs. mass number (A) Fe is most stable nucleus local peak Deuteron 3
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Coulomb Repulsive Force is Large v nucleon ~ 0.3 c prt in 2 5 Separation ~ 2 x 10 -15 m   2 19 9 12 1.6 10 1 0 qq k   2 2 15 91 21 0 0.22 8 12 6 lb f f electrostatic Fk r lbs  58 12.6lbs of force 1 N N  4
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Nuclear Binding – The strong force II. Large mass number: neutron proton n p schematic nucleus I. Small mass number: n p p n interior nucleons He electrostatic repulsion 2 4 exterior As size of nucleus p n (A-Z)=Z nucleons electrostatic attractive very ort range ~2 fm)
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Lecture_38 - PHYS 342 Fall 2011 Lecture 38: Nuclear...

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