Microscopic analysis of nuclear quantum phase transitions in the N~90 region
| Autor: | Li, Z. P., Niksic, T., Vretenar, D., Meng, J., Lalazissis, G. A., Ring, P. |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Physical Review C-Nuclear Physics Volume 79 Issue 5 |
| ISSN: | 0556-2813 1089-490X |
| Popis: | The analysis of shape transitions in Nd isotopes, based on the framework of relativistic energy density functionals and restricted to axially symmetric shapes in Ref. \cite{PRL99}, is extended to the region $Z = 60$, 62, 64 with $N \approx 90$, and includes both $\beta$ and $\gamma$ deformations. Collective excitation spectra and transition probabilities are calculated starting from a five-dimensional Hamiltonian for quadrupole vibrational and rotational degrees of freedom, with parameters determined by constrained self-consistent relativistic mean-field calculations for triaxial shapes. The results reproduce available data, and show that there is an abrupt change of structure at N=90 that can be approximately characterized by the X(5) analytic solution at the critical point of the first-order quantum phase transition between spherical and axially deformed shapes. Comment: 37 pages, 15 figures, 1 table, accepted for publication in Phys. Rev. C |
| Databáze: | OpenAIRE |
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