Bulg. J. Phys. vol.49 no.1 (2022), pp. 057-066


Symmetry and Shape Coexistence in 10Be

M.A. Caprio1, A.E. McCoy2, P.J. Fasano1, T. Dytrych3,4
1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA
2Institute for Nuclear Theory, University of Washington, Seattle, Washington 98195-1550, USA
3Nuclear Physics Institute of the Czech Academy of Sciences, 250 68 Řež, Czech Republic
4Department of Physics and Astronomy, Baton Rouge, Louisiana State University, Louisiana 70803, USA
Abstract. Within the low-lying spectrum of 10Be, multiple rotational bands are found, with strikingly different moments of inertia. A proposed interpretation has been that these bands variously represent triaxial rotation and prolate axially-deformed rotation. The bands are well-reproduced in ab initio no-core configuration interaction (NCCI) calculations. We use the calculated wave functions to elucidate the nuclear shapes underlying these bands, by examining the Elliott SU(3) symmetry content of these wave functions. The ab initio results support an interpretation in which the ground-state band, along with an accompanying K = 2 side band, represent a triaxial rotor, arising from an SU(3) irreducible representation in the 0ℏω space. Then, the lowest excited K = 0 band represents a prolate rotor, arising from an SU(3) irreducible representation in the 2ℏω space.

doi: https://doi.org/10.55318/bgjp.2022.49.1.057

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