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.
After doing question 1 on the quiz, how does one determine which isotopes are non-spherical? At first I thought it was whenever the spin and parity from the shell model differ from the actual spin and parity but I'm not convinced that's correct.
ReplyDeleteThat is one way. It does not cover conditions were deviations do not result in spin and parity changes. View the Nilsson diagrams and you will see there are ranges where the nuclide are not spherical but the spin and parity do not change. Experimental evidence, such as gamma correlation, can then be used. For the most part computations are used. The link below is from the web page and provide much more detail.
ReplyDeletehttp://www.wheldon.talktalk.net/thesis/thesis/node10.html
This and the explanation by the TAs in class helped me understand this a lot thank you!
ReplyDeleteGreat, thanks!
DeleteInitially, I was extremely confused by the orbital filling of odd-odd nuclei, however the practice in the quiz was extremely helpful with elucidating the topic.
ReplyDeleteI think the examples are excellent for demonstrating the information.
DeleteThe answer to PDF Quiz 8 will be posted 5 July 2015.
ReplyDeleteAnswers to PDF Quiz 8 posted.
ReplyDeleteI learned about quantum numbers in my high school chemistry course which really helped me to understand the shell model.
ReplyDeleteglad to hear it; good to know you found some high school information still useful.
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