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news_050211 - -E system Δ m m parts-m sys = E b c 2...

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Stuff for Monday, May 2, 2011 PS #9 returned up front, PS #10 due. Quiz #5 returned up front. Quiz average: 8.5 ( read carefully! ) Midterm: 2 hours from 6:30pm to 10:00pm tomorrow here. Does everyone have the midterm handout? Annotate as desired. Schedule: Review tomorrow, lecture Wed. and Thur., no class Friday Stuff about nuclei and radioactivity: Nuclei: A Z X where A nucleons = Z protons + N neutrons Radius: r r 0 A 1 / 3 with r 0 = 1 . 2 fm closest α : r min = k ( 2 e )( Ze ) / K 0 1 u = atomic mass unit 1 12 ( mass of 12 6 C ) = 931 . 48 MeV / c 2 m p = 1 . 007277 u m n = 1 . 008665 u m e = 0 . 0005486 u Binding energy E b E parts
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Unformatted text preview: -E system , Δ m ≡ m parts-m sys = E b / c 2 nucleus: Δ m = Z m H + Nm n-m atom where m H = 1 . 007825 u Stability: Can the nucleus lower its energy by radioactive decay? Decays: alpha, beta (neutron β-, proton β + , EC) = ⇒ ν or ν , gamma Unstable nuclei Check Table of Nuclides (google, e.g., http://atom.kaeri.re.kr/ ) Binding energy calculation: (6*1.007825u + 9*1.008665u-15.0105993u)*931.48 MeV/u = 106.501 MeV Coulomb Energy Symmetry Energy...
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