Bulg. J. Phys. vol.46 no.4 (2019), pp. 325-336

Proxy-SU(3) Symmetry for Heavy Deformed Nuclei: Nuclear Spectra

D. Bonatsos1, I.E. Assimakis1, A. Martinou1, S.K. Peroulis1, S. Sarantopoulou1, N. Minkov2
1Institute of Nuclear and Particle Physics, National Centre for Scientific Research
2Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tzarigrad Road, 1784 Sofia, Bulgaria
Abstract. The systematics of experimental energy differences between the levels of the ground state band and the γ1 band in even-even nuclei are studied as a function of the angular momentum L, demonstrating a decrease of the energy differences with increasing L, in contrast to what is seen in vibrational, γ-unstable, and triaxial nuclei. After a short review of the relevant predictions of several simple collective models, it is shown that this decrease is caused in the framework of the proxy-SU(3) scheme by the same three-body and/or four body operators which break the degeneracy between the ground state band and the γ1 band, predicting in parallel the correct form of odd-even staggering within the γ1-bands.

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