Microscopic analysis of nuclear quantum phase transitions in the N ≈ 90 region
2009; American Institute of Physics; Volume: 79; Issue: 5 Linguagem: Inglês
10.1103/physrevc.79.054301
ISSN1538-4497
AutoresZ. P. Li, Tamara Nikšić, D. Vretenar, Jie Meng, G. A. Lalazissis, Peter Smith Ring,
Tópico(s)Advanced Chemical Physics Studies
ResumoThe analysis of shape transitions in Nd isotopes, based on the framework of relativistic energy-density functionals and restricted to axially symmetric shapes in T. Nik\ifmmode \check{s}\else \v{s}\fi{}i\ifmmode \acute{c}\else \'{c}\fi{}, D. Vretenar, G. A. Lalazissis, and P. Ring [Phys. Rev. Lett. 99, 092502 (2007)], is extended to the region $Z=60,62,64$ with $N\ensuremath{\approx}90$ and includes both $\ensuremath{\beta}$ and $\ensuremath{\gamma}$ 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.
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