Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2005-12-11
Phys.Rev. C73 (2006) 014312
Physics
Nuclear Physics
Nuclear Theory
22 pages, 13 figures, 2 tables
Scientific paper
10.1103/PhysRevC.73.014312
We study in cranked Nilsson plus random phase approximation shape transitions in fast rotating nuclei undergoing backbending, more specifically 156Dy and 162Yb. We found that a backbending in 156Dy is correlated with the disappearance of the collective, positive signature gamma-vibrational mode in the rotating frame, and, a shape transition (from axial to nonaxial) is accompanied with a large acquiring of the gamma-deformation. We show that such a shape transition can be considered as a phase transition of the first order. In 162Yb the quasiparticle alignment dominates in the backbending and the shape transition (from axial to nonaxial) is accompanied with a smooth transition from zero to nonzero values of the gamma-deformation. We extend the classical Landau theory for rotating nuclei and show that the backbending in 162Yb is identified with the second order phase transition. A description of spectral and decay properties of the yrast states and low-lying excitations demonstrates a good agreement between our results and experimental data.
Kvasil Jan
Nazmitdinov Rashid G.
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