https://doi.org/10.1140/epja/s10050-025-01684-5
Regular Article - Theoretical Physics
Theoretical investigation of near yrast bands in odd-mass 
La isotopes
1
Department of Physics and Astronomical Sciences, Central University of Jammu, 181143, Samba, Jammu and Kashmir, India
2
Department of Higher Education (GDC Shopian), 192303, Shopian, Jammu and Kashmir, India
3
Department of Physics, Islamic University of Science and Technology, 192122, Awantipora, Jammu and Kashmir, India
4
Department of Physics, University of Jammu, 180006, Jammu, Jammu and Kashmir, India
a
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b
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Received:
24
May
2025
Accepted:
28
August
2025
Published online:
11
September
2025
Theoretical investigation of negative parity bands in odd-mass La isotopes has been carried out by using Triaxial Projected Shell Model approach (TPSM). Potential Energy Surface (PES) calculations suggest 
-soft nature of these isotopes. This finding is further supported by an analysis of their quadrupole shape invariants, which indicates that the nuclei have a soft-triaxial shape. Suitable deformation parameters, which are in agreement with the previous studies, are used to generate the band energies of the yrast band, -band, and their signature partners. The bandhead energies of all the bands are in good agreement with the experimental values. Further, structural properties like band diagrams, backbending in moment of inertia, dynamic moment of inertia, signature splitting and reduced transition probabilities (B(E2) and B(M1)) have also been calculated.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
