https://doi.org/10.1140/epjp/s13360-024-05211-1
Regular Article
Structure of nnn/ppp three quasiparticle quadruplets in odd-A nuclei
1
Department of Physics, Akal University Talwandi Sabo, 151302, Bathinda, Punjab, India
2
Amity Institute of Nuclear Science and Technology, Amity University, UP, 201313, Noida, India
Received:
5
March
2024
Accepted:
23
April
2024
Published online:
16
May
2024
In the present article, we have explored the nuclear structure of 9 three quasiparticle (3qp) quadruplets arising from the coupling of like particles (nnn/ppp) observed in odd-A 179Hf, 175,181Ta, 177,179,183W, 183Re, and 185Os nuclides and also confirmed the configuration assignment to 3qp quadruplets observed in 175,177Ta and 179W nuclides. To accomplish these objectives, we adopted a revised version of semi-empirical model formulation that includes all the necessary physical interactions namely the pairing among nucleons, rotation of even-even core, rotor-particle, particle–particle coupling, irrotational contributions arising from valence nucleons, and residual interactions. These interactions can affect the magnitude of bandhead energies as well as the ordering among different members of given 3qp quadruplet. We obtained an excellent agreement among calculated bandhead energies and corresponding experimental data for all the nine 3qp quadruplets which indicates the versatility and applicability of the present model formulation. Notably, the average deviation in the present model calculations is 110.2 keV, a substantial improvement (> 50%) as compared to the earlier model, which yielded a deviation of 230.3 keV. Inspired from the success of present model calculations, we predicted the bandhead energies of 27 unobserved members of these quadruplets. The validity and reliability of present model calculations are also supported by the fact that the energy ordering among different members of a given 3qp quadruplet satisfies the generalized GM rules except 5/2[402]π ⊗ 7/2[404]π ⊗ 9/2[514]π 3qp configuration observed in 175Ta and 181Ta nuclides. The observed violation of generalized GM rules in 5/2[402]π ⊗ 7/2[404]π ⊗ 9/2[514]π configuration in both nuclides (175Ta and 181Ta) is attributed to the rotational perturbation that especially affects the locations of high-K members of a given 3qp quadruplets and in the present case above said rotational perturbation reverse the energy ordering of Kπ = 11/2− and Kπ = 21/2− bandheads. We also demonstrated the application of the present semi-empirical model calculations in the configuration assignment to 3qp states observed in odd-A nuclei. We confirmed the configuration assignments of energy states at 1551.7 keV, 1522.9 keV, and 1632.0 keV observed in 175Ta, 177Ta, and 179W nuclides, respectively, as Kπ = 17/2+: 7/2[404]π ⊗ 9/2[514]π ⊗ 1/2[541]π, Kπ = 17/2+:9/2[514]π ⊗ 1/2[521]ν ⊗ 7/2[633]ν and Kπ = 21/2+: 9/2[624]ν ⊗ 7/2[514]ν ⊗ 5/2[512]ν 3qp configurations from various probable configurations suggested in literature due to lack of experimental evidence.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. 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.
