Alpha Decay Contents: What it is Energy of radiation from mass defectEnergy of radiation from mass defect Whiteboard Why and how Tunneling.

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Presentation transcript:

Alpha Decay Contents: What it is Energy of radiation from mass defectEnergy of radiation from mass defect Whiteboard Why and how Tunneling

Alpha Decay - Energy of alpha particle TOC Calculating mass defect of alpha decay 92-U >90-Th Alpha > (Appendix F, for Alpha = He 4) (#electrons?) > (products have less mass) Mass defect = parent - products = = u E k = ( u)(931.5 MeV/u) = MeV (Less - daughter E k ) 1 u = MeV He (neutral atom) = u

Whiteboards: Alpha Energy 11 | 22 TOC

W Parent mass = u Product mass = u u = u Mass defect = parent - products = u Energy of radiation = ( u)(931.5 MeV/u) = MeV = (5.892 x10 6 eV)(1.602 x J/eV) = x J Bk --> Am +  > What is energy of alpha? (in MeV and J) MeV, x J

W Parent mass = u Product mass = u u = u Mass defect = parent - products = u Energy of radiation = ( u)(931.5 MeV/u ) = MeV = (5.439 x10 6 eV)(1.602 x J/eV) = x J E k = 1 / 2 mv 2, m = 6.64 x kg, E k = x J v = 1.62 x 10 7 m/s Am --> Np +  > (It’s a decay series!!!) What is energy of alpha? (in MeV and J) What is the velocity of the alpha? (Assume? that the alpha gets all the kinetic energy) m  = 6.64x kg MeV, x J, 1.62 x 10 7 m/s

Why Alpha Decay TOC Only possible if mass products < parent Tendency to reduce potential energy Larger nuclei He nucleus is rather tightly bound He Nucleus

Tunneling - Energy is not conserved! TOC Alpha shouldn’t escape (energy) Et > h/2Et > h/2 Violates COE (briefly) “Tunneling” Pure quantum randomness E k of alpha - observed Shape of curve Capture of Alpha: Repulsion - Coulombic Attraction - Strong Nuc. E k(Alpha) < E k(Capture)