Abstract
Background: The softness of makes it possible to study the shape changes induced by two-proton or two-neutron excitation.
Purpose: We measure the lifetimes of two-quasiparticle states of the bands based on the states at 3296 and 3279 keV to investigate the shape change induced by the alignment of two protons or two neutrons in the orbital.
Methods: The recoil-distance Doppler shift method was used for the study of studies, which was formed by the fusion reaction , at MeV. Calculations were performed within the microscopic-macroscopic approach, based on the deformed Woods-Saxon single-particle potential and the Yukawa-plus-exponential macroscopic energy.
Results: The lifetime of the state at 3279 keV of was measured to be ns. The lifetimes of the state at 374 keV and of the state at 3686 keV of the ground band were also measured to be ps and ps.
Conclusions: The measured lifetime of the state at 3279 keV together with other observables confirm the structure change in . A rather small reduced hindrance of the electromagnetic decay of the state at 3279 keV would be consistent with its -mixed character.
2 More- Received 6 June 2019
DOI:https://doi.org/10.1103/PhysRevC.100.014330
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