Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-03-11
Phys. Rev. C81:034302,2010
Physics
Nuclear Physics
Nuclear Theory
11 pages, 3 figures
Scientific paper
10.1103/PhysRevC.81.034302
The potential energy surfaces of even-even $^{146-156}$Sm are investigated in the constrained reflection-asymmetric relativistic mean-field approach with parameter set PK1. It is shown that the critical-point candidate nucleus $^{152}$Sm marks the shape/phase transition not only from U(5) to SU(3) symmetry, but also from the octupole-deformed ground state in $^{150}$Sm to the quadrupole-deformed ground state in $^{154}$Sm. By including the octupole degree of freedom, an energy gap near the Fermi surface for single-particle levels in $^{152}$Sm with $\beta_2 = 0.14 \sim 0.26$ is found, and the important role of the octupole deformation driving pair $\nu 2f_{7/2}$ and $\nu 1i_{13/2}$ is demonstrated.
Li Zhi Peng
Meng Jie
Zhang Shao-Qing
Zhang Wanchuan
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