This lecture provides information on nuclear force and nuclear models. The strong force is introduced through isospin. A comparison of exchange particles is provided. The use of mirror nuclei to examine the strong force is presented. An overview of nuclear potentials is provided and used as a basis of the shell model. States of the shell model and their relationship to magic numbers are discussed. Use of the shell model is determine nuclide spin and parity is presented. From the shell model the unpaired nucleon is used to assess overall nuclear spin. Examples are provided for nuclei with one or two unpaired nucleons. Nordheim rules are used to evaluation spin and parity with odd-odd nuclei. The relationship between spin and parity with nuclear deformation is introduced with Nilsson diagrams. Additional information on Nilsson diagrams can be found in the Table of the Isotopes. An introduction of the Fermi model for energetic nuclei is given.
It's interesting that the nucleons follow the same energy patterns as the electrons. Why do the electrons skip energy levels but nucleons don't. Fermi gas part was cool too… I wish I had a better background in quantum mechanics though so I could understand what these spin values and parity really mean.
ReplyDeleteThe commonalities for spin 1/2 particles is good to use. The nuclear shells do have some different behavior compared electron shells with filling.
ReplyDeleteDetermination of spin and parity for roughly spherical nuclei is fairly straightforward, even more-so than I expected. However, it seems that it can get complicated quite quickly when the shape of nuclei cannot be modeled as a sphere.
ReplyDeleteThe deformed nuclear systems can get very complicated. We will examine some simple systems and look at some literature on more complicated analysis
ReplyDeleteI finished the lecture and quiz. the spin and parity are still giving me a little trouble but I think I got it.
ReplyDeleteGreat. I will review the shell model in the lecture meeting.
ReplyDeleteI like the use of the shell model and nilsson diagrams to show how spin and parity originate from.
ReplyDeletethanks for your comments!
ReplyDelete