Sumários

Production of Radioactivity and Alpha Decay (online class)

24 abril 2020, 11:00 • Elmar Biernat

Production of Radioactivity

  • secular equilibrium
  • transient equilibrium
  • decay chains
  • series of decays, Bateman equations
(Literature: Chapter 6 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)
Alpha decay
  • Q-value
  • Geiger-Nuttall-law
  • Gamow-Gurney-Condon-Theory
(Literature: Chapter 8 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)

Outline and Introduction to radioactivity (online class)

22 abril 2020, 10:00 • Elmar Biernat

  • Natural radioactivity: from heavy elements formed in stars
  • Main types of decays: alpha, beta, gamma
  • Alpha-Decay chains
  • Radioactive decay law: decay constant, activity, units, partial decay constants
  • Production of radioactivity in nuclear reactor or accelerator, production rate
(Literature: Chapter 6 in Introductory Nuclear Physics. K. S. Krane, Wiley 1987)

Predictions of the nuclear shell model (aula online)

17 abril 2020, 11:00 • Alfred Stadler

The extreme single-particle shell model. Predictions for nuclear spin and parity in the ground state. Calculation of nuclear magnetic dipole moments. The Schmidt lines. Electric quadrupole moments. Excitation spectra and the limits of the extreme single-particle shell model. Evidence for collective motion (vibration and rotation) of nuclei. 


(Krane, ch. 5)

The nuclear shell model (aula online)

15 abril 2020, 10:00 • Alfred Stadler

Outline of the derivation of the one-pion-exchange potential.


III. The nuclear shell model. 

Indications for a shell structure in atomic physics. Experimental evidence for nuclear shell structure. The basic assumptions of the nuclear shell model.
The magic numbers. Energy gaps with various central single-nucleon potentials. The emergence of the magic numbers with a spin-orbit interaction.

(Krane, ch. 5)

Features of the nucleon-nucleon interaction (aula online)

3 abril 2020, 11:00 • Alfred Stadler

Evidence for strong spin-dependence of the nucleon-nucleon potential from low-energy neutron-proton total cross section measurements. 
The sign of S-wave phase shifts, and experimental evidence for the existence of a short-range repulsive core in the nucleon-nucleon potential. 
The requirement of a non-central force to explain the existence of a D-state (in addition to the dominant S-wave) component in the deuteron wave function. The nucleon-nucleon tensor force. 
The lowest-order velocity-dependent component of the nucleon-nucleon interaction: the spin-orbit force.The nucleon-nucleon spin-orbit force and polarization. The exchange force model. The one-pion exchange nucleon-nucleon interaction. Exchange of heavier mesons for intermediate and shorter range interactions.

(Krane, ch. 4)