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Octupole degree of freedom for the critical-point candidate nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Sm</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>152</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>in a reflection-asymmetric relativistic mean-field approach
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 …