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Investigation of the Yb and W Isotopic Chains using the Confined β-Soft Rotor Model

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Published: Feb 24, 2026
DOI: https://doi.org/10.12681/hnpsanp.8764
Keywords:
CBS calculations, rigid-rotor, Yb, W
Dimitrios Papadopoulos
Department of Physics, Zografou Campus, GR-15784, National and Kapodistrian University of Athens, Greece
https://orcid.org/0009-0004-0095-9497
Theodoros Mertzimekis
Department of Physics, Zografou Campus, GR-15784, National and Kapodistrian University of Athens, Greece
https://orcid.org/0000-0001-9191-7903
Pavlos Koseoglou
Department of Physics, Zografou Campus, GR-15784, National and Kapodistrian University of Athens, Greece
https://orcid.org/0000-0003-4520-4448
Dennis Bonatsos
Institute of Nuclear and Particle Physics, NCSR "Demokritos", GR-15310, Aghia Paraskevi, Greece
https://orcid.org/0000-0003-1728-0910
Polytimos Vasileiou
Department of Physics, Zografou Campus, GR-15784, National and Kapodistrian University of Athens, Greece
https://orcid.org/0000-0003-1446-8619
Margarita Efstathiou
Department of Physics, Zografou Campus, GR-15784, National and Kapodistrian University of Athens, Greece
https://orcid.org/0009-0006-1292-4974
Abstract

The Confined β-soft (CBS) rotor model provides a simple collective approach in the region between the spherical vibrator and the axially deformed rotor limit for axially symmetric prolate (γ≈0) shapes. Even-even isotopes of Ytterbium and Tungsten serve as a good testing ground for exploring fundamental aspects of nuclear structure, as their R4/2=E(4+)/E(2+) ratio lies between 2.9 and 3.333. In the present study, the CBS formalism is applied to calculate the energies of the ground-state band, the associated B(E2) transition rates and the β-band excitations, directly comparing these predictions to available experimental data. The results demonstrate that CBS succeeds in reproducing the observed spectra and transition strengths for the case of axially symmetric isotopes of Yb and W.

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