Octupole degree of freedom for the critical-point candidate nucleus $^{152}$Sm in a reflection-asymmetric relativistic mean-field approach - Nuclear TheoryReport as inadecuate




Octupole degree of freedom for the critical-point candidate nucleus $^{152}$Sm in a reflection-asymmetric relativistic mean-field approach - Nuclear Theory - Download this document for free, or read online. Document in PDF available to download.

Abstract: The potential energy surfaces of even-even $^{146-156}$Sm are investigated inthe constrained reflection-asymmetric relativistic mean-field approach withparameter set PK1. It is shown that the critical-point candidate nucleus$^{152}$Sm marks the shape-phase transition not only from U5 to SU3symmetry, but also from the octupole-deformed ground state in $^{150}$Sm to thequadrupole-deformed ground state in $^{154}$Sm. By including the octupoledegree of freedom, an energy gap near the Fermi surface for single-particlelevels in $^{152}$Sm with $\beta 2 = 0.14 \sim 0.26$ is found, and theimportant role of the octupole deformation driving pair $ u 2f {7-2}$ and $ u1i {13-2}$ is demonstrated.



Author: W. Zhang, Z. P. Li, S. Q. Zhang, J. Meng

Source: https://arxiv.org/







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