Abstract
We investigate the robustness of “noncollective” rotational behavior for nuclei with random two-body interactions in the framework of nuclear shell model. The normal behavior of average excitation energy of yrast states is universal for both even-nucleon and odd-nucleon systems by two-body random ensemble. In some special random samplings, especially the samplings with spin- ground state, the inverse noncollective rotational behavior is found for both even-nucleon and odd-nucleon systems in this paper. Interestingly, above rotational behaviors are still robust in the presence of random two-body interactions plus realistic single-particle energies.
2 More- Received 9 July 2021
- Revised 30 October 2021
- Accepted 16 November 2021
DOI:https://doi.org/10.1103/PhysRevC.104.054319
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