Shape-phase transitions in odd-mass $\gamma$-soft nuclei with mass $A\approx 130$
| Autor: | Nomura, K., Nikšić, T., Vretenar, D. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 96, 014304 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.96.014304 |
| Popis: | Quantum phase transitions between competing equilibrium shapes of nuclei with an odd number of nucleons are explored using a microscopic framework of nuclear energy density functionals and a particle-boson core coupling model. The boson Hamiltonian for the even-even core nucleus, as well as the spherical single-particle energies and occupation probabilities of unpaired nucleons, are completely determined by a constrained self-consistent mean-field calculation for a specific choice of the energy density functional and pairing interaction. Only the strength parameters of the particle-core coupling have to be adjusted to reproduce a few empirical low-energy spectroscopic properties of the corresponding odd-mass system. The model is applied to the odd-A Ba, Xe, La and Cs isotopes with mass $A\approx 130$, for which the corresponding even-even Ba and Xe nuclei present a typical case of $\gamma$-soft nuclear potential. The theoretical results reproduce the experimental low-energy excitation spectra and electromagnetic properties, and confirm that a phase transition between nearly spherical and $\gamma$-soft nuclear shapes occurs also in the odd-A systems. Comment: 13 pages, 15 figures, 9 tables |
| Databáze: | arXiv |
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