Sumários

Gamma Deacy (cont.) and Nuclear Reactions (online class)

27 Maio 2020, 10:00 Elmar Biernat

Gamma Decay

  • Angular momentum-parity selection rules; competing multipole emissions; isomeric transitions
  • Internal conversion; electron energy spectrum; internal conversion coefficients; E0 transitions
Nuclear Reactions
  • Types of reactions; classifications
  • Observables and conservation laws
  • Examples of nuclear reactions
(Literature: Chapter 11 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)


Beta Decay Selection Rules (cont.) and Gamma Decay (online class)

22 Maio 2020, 11:00 Elmar Biernat

Beta Decay

  • Mirrow decays and non-mirrow decays
  • Selection rules for forbidden decays
  • ft values and degree of forbiddeness
Gamma Decay
  • Kinematics
  • RECAP: Classic em radiation, multipole moment, multipole radiation, angular distribution, parity, radiated power
  • Quantum-mechanical multipole operators, decay constant for gamma emission, estimates for multipole operators
  • Weisskopf estimates for electric and magnetic transitions, interpretations
  • Selection rules: angular momentum, parity, magnetic and electric transitions
(Literature: Chapter 10 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)


Beta Decay (cont.) (online class)

15 Maio 2020, 11:00 Elmar Biernat

  • Electron/positron momentum and energy distributions
  • Fermi function and shape factor
  • Experimental tests of Fermi's theory, Fermi-Kurie plots
  • Comparative half lives, ft value
  • Strength of weak nuclear interaction
  • The fundamental weak interaction 
  • Neutrino mass from beta spectrum, most recent estimates
  • Allowed decays: Fermi and Gamow-Teller, selection rules
  • Mixed decays, mixing in free neutron decay
(Literature: Chapter 9 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)


Quantum Theory of Radioactive Decay (cont.) and Beta Decay (online class)

13 Maio 2020, 10:00 Elmar Biernat

Quantum Theory of Decays

  • Quasi-stationary states, decay law, width
  • Derivation of Fermi's Golden Rule
(Literature: Chapter 6 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)
 Beta Decay
  • Neutrinos
  • Q values for negative and positive beta decays and electron capture
  • Fermi's Golden Rule for negative and positive beta decay
  • Number of final states
(Literature: Chapter 9 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)


Alpha Decay (cont.) and Quantum Theory of Radioactive Decay (online class)

8 Maio 2020, 11:00 Elmar Biernat

Alpha Decay

  • Quantum mechanics recap: conservation of probability, probability flux
  • Tunneling of alpha through rectangular barrier, transmissivity
  • Gamow-Gurney-Condon-Theory: Tunneling of alpha through Coulomb barrier, Gamow factor, recover Geiger-Nuttall law, compare with data
  • decays into other light nuclei
(Literature: Chapter 8 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)
Quantum Theory of Radioactive Decay
  • Imaginary part in potential
  • Quantum mechanics recap: stationary states