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Shape transitions and collective behaviour of Er and Yb isotopes based on relativistic energy density functional theory

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Published: Feb 24, 2026
DOI: https://doi.org/10.12681/hnpsanp.8896
Keywords:
Nuclear structure theory Relativistic density functionals Shape transitions
Konstantinos Karakatsanis
Democritus University of Thrace
Theo J. Mertzimekis
National and Kapodistrian University of Athens
https://orcid.org/0000-0001-9191-7903
Pavlos Koseoglou
National and Kapodistrian University of Athens
https://orcid.org/0000-0003-4520-4448
Abstract

In this work a collective Hamiltonian based on relativistic energy density functional calculations has been used to study the basic spectroscopic properties of Er and Yb isotopes with 82 < 𝑁 < 114. Starting from a series of shape constrained calculations, we build a Bohr-type Hamiltonian the diagonalisation of which gives the collective excitations and transition probabilities. We are thus able to follow the transition of shapes, which is established through projected energy surfaces and specific spectroscopic quantities such as energy ratios and the structure of the low lying excited states.

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