news_050411

news_050411 - Decays: alpha, beta (neutron -, proton + ,...

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Stuff for Wednesday, May 4, 2011 No class on Friday! No problem set due tomorrow! Next two problem sets (Q12/13 and Q14/15) available. No quiz this week! 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 - 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?
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Unformatted text preview: Decays: alpha, beta (neutron -, proton + , EC) = or , 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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news_050411 - Decays: alpha, beta (neutron -, proton + ,...

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