Collective rotational bands at low excitation energy in 186Os: Vibrational and rotational degrees of freedom
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Date
2022
Authors
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Publisher
American Physical Society
Abstract
Collective structures in 186Os have been investigated through the 186W(4He, 4n) 186Os reaction, at a beam
energy of 48 MeV. The low-lying bands built on the excited 0+
2 , 2+
2 , and 4+
3 states have been extended up to
spins of 12+, 15+, and 8+, respectively, and a number of new linking transitions were identified. The features
of the collective bands in 186Os, such as level energies, are presented in the context of a systematic study of
the neighboring even-even 182–192Os isotopes. In addition, the validity of the K-selection rule, stemming from
a description based on axial symmetry of the nuclear shape, is examined. The observed decays between the
rotational bands support a description where K is conserved. However, some K-forbidden decays were also
identified, suggesting that a model allowing for small K admixtures is probably required. The experimental
data are further compared with calculations using a five-dimensional collective Hamiltonian based on covariant
density functional theory. The calculations predict that the collective bands are associated with different nuclear
shapes, varying in quadrupole deformation, triaxiality, and softness.
Description
Keywords
Physics, Energy, Astronomy, Nuclear
Citation
Mdletshe, L. et al. (2022). Collective rotational bands at low excitation energy in 186Os: Vibrational and rotational degrees of freedom. Physical Review C, 106, 044325. 10.1103/PhysRevC.106.044325