Lecture12RadioactiveDecay_001

Lecture12RadioactiveDecay_001 - ure dioactive Decay mode :...

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Lectu ure 12 Rad dioactive D ecay mode es : Gamm a, Fission, Cluster, D elayed n/ p, Double Beta decay
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IV. Gamma Decay Analogous process to photon emission from atoms and molecules (uv, x-rays, IR …) Z A X Z Am 0 0 Z A + X  where m * = excited state E Q (recoil energy negligible) i.e. Nucleus changes its energy state. E 2 I 2 , 2 E 1 I 1 , E 1 = E 2 + E 3 1 3 E 0 I 0 , [ Q = E + E R ; E R ~ eV ] M ssbauer effect ] A. Occurrence 1. De-excitation after nuclear reactions or radioactive decay. t 1/2 ( ) 10 14 s ELECTROMAGNETIC INTERACTION 2. t 1/2 ( ) = f (E , I,  ) S h o r t t 1/2 ( ): Large E , I = 0,  = NO Long t 1/2 ( ): Small E , I = large,  = YES 3. Isomers: t 1/2 10 6 s (arbitrary definition) Unusually long-lived -ray emitters m = meta stable NOTE: For radioactive labeling of compounds, would like t 1/2 ~ hours – days stable product B. Competing Mechanisms for -decay 1. Photon Emission: 0 0 Two-body decay DISCRETE ENERGIES E 2. Internal Conversion: IC E 1 = E 2 E 0 E 2 = E 2 E1 E 3 = E 1 E 0
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a. Excess nuclear energy transferred to an atomic electron
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Lecture12RadioactiveDecay_001 - ure dioactive Decay mode :...

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