Do Rotational Bands in Nuclei Indicate Changes in Deformation or Nucleon Levels?

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SUMMARY

Rotational bands in nuclei are primarily associated with different Nilsson Model levels, indicating that these bandheads arise from changes in nuclear deformation rather than individual nucleon level changes. The discussion highlights that quasiproton excitations represent collective excitations behaving like a single proton. However, for systems with an odd number of nucleons, the lowest non-collective excitations are identified as single-quasiparticle states, leading to some confusion regarding the nature of these excitations.

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  • Nilsson Model levels
  • Quasiproton excitations
  • Collective vs. non-collective excitations
  • Single-quasiparticle states
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Nuclear physicists, researchers studying nuclear structure, and students interested in the dynamics of rotational bands and excitations in nuclei.

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A nucleus has several rotational bands built on different Nilsson Model levels. Do these bandheads occur for different deformation of the nucleus or does an individual nucleon change level?

My educated guess is that it's the deformation that changes, but I need to be sure. :)
 
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I read in a paper that these rotational bands in the nucleus I'm studying are based on quasiproton excitations. So this means it's a collective excitation that behaves like a single proton.

However when I look into a different paper, I read this.
For a system with an odd number of nucleons the lowest non-collective excitations are single-quasiparticle states.

Now I'm confused.
 

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