{beta} and {gamma} bands in N= 80, 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory: Vibrations, shape coexistence, and superdeformation

Majola, S. N. T.; Shi, Z; Song, B. Y.; Li, Z. P.; Zhang, S. Q.; Bark, R A; Sharpey-Schafer, J. F.; Aschman, D. G.; Bvumbi, S. P.; Bucher, T. D.; Stolze, S.

doi:10.1103/PhysRevC.100.044324

Title: {beta} and {gamma} bands in N= 80, 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory: Vibrations, shape coexistence, and superdeformation

Journal Article · Wed Oct 30 00:00:00 EDT 2019 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.100.044324· OSTI ID:1839942

Majola, S. N. T.; Shi, Z; Song, B. Y.; Li, Z. P.; Zhang, S. Q.; Bark, R A; Sharpey-Schafer, J. F.; Aschman, D. G.; Bvumbi, S. P.; Bucher, T. D.; Stolze, S.

A comprehensive systematic study is made for the collective β and γ bands in even-even isotopes with neutron numbers N = 88 to 92 and proton numbers Z = 62 (Sm) to 70 (Yb). Data, including excitation energies, B(E0) and B(E2) values, and branching ratios from previously published experiments are collated with new data presented for the first time in this study. The experimental data are compared to calculations using a five-dimensional collective Hamiltonian (5DCH) based on the covariant density functional theory (CDFT). A realistic potential in the quadrupole shape parameters V (β, γ ) is determined from potential energy surfaces (PES) calculated using the CDFT. The parameters of the 5DCH are fixed and contained within the CDFT. Overall, a satisfactory agreement is found between the data and the calculations. In line with the energy staggering S(I ) of the levels in the 2γ + bands, the potential energy surfaces of the CDFT calculations indicate γ -soft shapes in the N = 88 nuclides, which become γ rigid for N = 90 and N = 92. The nature of the 02 + bands changes with atomic number. In the isotopes of Sm to Dy, they can be understood as β vibrations, but in the Er and Yb isotopes the 02 + bands have wave functions with large components in a triaxial superdeformed minimum. In the vicinity of 152Sm, the present calculations predict a soft potential in the β direction but do not find two coexisting minima. This is reminiscent of 152Sm exhibiting an X(5) behavior. The model also predicts that the 03 + bands are of two-phonon nature, having an energy twice that of the 02 + band. This is in contradiction with the data and implies that other excitation modes must be invoked to explain their origin.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Research Foundation (NRF) South Africa; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); National Research Development and Innovation Office of Hungary (NKFIH); USDOE Office of Science - Office of Nuclear Physics

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1839942

Journal Information:: Physical Review C, Nuclear Physics, Vol. 100, Issue 4

Country of Publication:: United States

Language:: English

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