When to use collective and when shell model?

In summary, the conversation is about understanding when to use one model over the other and how to determine the type of excitation in a nucleus. The person is confused and seeking clarification on how to differentiate between nucleon jumping in a different shell, rotational/vibrational excitation, and how they relate to shell model energies. They are also wondering if these excitations are built on top of each other or if they are completely different. They are asking for help and expressing their appreciation for any guidance.
  • #1
Malamala
299
27
I am sorry if this is a silly question, but I am confused about it. When do I use a model over the other? I understand how they work separately, but I didn't understand from my readings when I should use one over the other and why. And when I look at an actual level scheme of a nucleus (for example this one, but any other would do just fine), how do I know what kind of excitation is it? Is it a nucleon jumping in a different shell, is it a rotational/vibrational excitation? Are the rotational/vibrational excitations built on top of shell model energies (similar to vibrational/rotational states on top of electronic ones in a molecule) or they are completely different (i.e. different pictures)? I am really lost and any help would be greatly appreciated. Thank you!
 

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