https://doi.org/10.1140/epja/s10050-023-01003-w
Regular Article –Theoretical Physics
Intrinsic quartet states and band-like structures in 
nuclei
1
Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Via S. Sofia 64, 95123, Catania, Italy
2
National Institute of Physics and Nuclear Engineering, Magurele, P.O. Box MG-6, Bucharest, Romania
Received:
17
February
2023
Accepted:
8
April
2023
Published online:
27
April
2023
The band structure of nuclei is constructed by projecting states of good angular momentum from intrinsic states defined in terms of quartets. The simplest of these intrinsic states is a condensate of collective quartets with isospin 
. The other intrinsic states are built by promoting one quartet of the condensate to an excited configuration. From these intrinsic states, by angular momentum projection, band structures are generated that approximate well the experimental ones. The projected states also reproduce to a very good extent the spectra resulting from configuration interaction calculations based on the same quartets forming the intrinsic states. These results show that the quartet-based intrinsic states provide an appropriate framework to understand in a simple and intuitive manner the emergence of band-like structures in nuclei.
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