Predominance of Triaxial Shapes in Transitional Super-Heavy Nuclei: Ground-State Deformation and Shape Coexistence along the Flerovium (Z=114) Chain of Isotopes

Physical Review Letters
J L Egido, Andrea Jungclaus

Abstract

We present the first triaxial beyond-mean-field study of even-even super-heavy nuclei. Calculations for the even Flerovium isotopes towards the supposed N=184 neutron shell closure were performed using the effective finite-range density-dependent Gogny force. They include the restoration of the particle-number and angular-momentum symmetries and the mixing of different shapes using the generator coordinate method. The importance of the γ degree of freedom is highlighted by comparing the triaxial to axial-symmetric calculations performed within the same framework. For the three even Fl isotopes between the prolate ^{288}Fl and the oblate ^{296}Fl triaxial ground-state shapes are predicted, whereas axial-symmetric calculations suggest a sharp prolate-oblate shape transition between ^{290}Fl and ^{292}Fl. A novel type of shape coexistence, namely, that between two different triaxial shapes, is predicted to occur in ^{290}Fl. Finally, the existence of a neutron shell closure at N=184 is confirmed, while no evidence is found for Z=114 being a proton magic number.

References

Sep 28, 2004·Physical Review Letters·J L EgidoR R Rodríguez-Guzmán
Feb 18, 2005·Nature·S CwiokW Nazarewicz
Oct 1, 2013·Physical Review Letters·D RudolphN Wiehl
Jan 25, 2014·Inorganic Chemistry·Alexander YakushevNorbert Wiehl
Mar 10, 2015·Reports on Progress in Physics·Yu Ts Oganessian, V K Utyonkov

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Citations

May 29, 2021·Physical Review Letters·J Luis Egido, Andrea Jungclaus

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