High-spin transition quadrupole moments in neutron-rich Mo and Ru nuclei: testing $\gamma$ softness?

Abstract

The transition quadrupole moments, $Q_t$, of rotational bands in the neutron-rich, even-mass ${}^{102-108}$Mo and ${}^{108-112}$Ru nuclei were measured in the 8 to 16 $\hslash$ spin range with the Doppler-shift attenuation method. The nuclei were populated as fission fragments from ${}^{252}$Cf fission. The detector setup consisted of the Gammasphere spectrometer and the HERCULES fast-plastic array. At moderate spin, the $Q_t$ moments are found to be reduced with respect to the values near the ground states. Attempts to describe the observations in mean-field-based models, specifically cranked relativistic Hartree-Bogoliubov theory, illustrate the challenge theory faces and the difficulty to infer information on $\gamma$ softness and triaxiality from the data.

17 pages, 4 figures

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Cited by in corpus (7)

• Global performance of covariant energy density functionals: ground state observables of even-even nuclei and the estimate of theoretical uncertainties
• Covariant density functional theory: Reexamining the structure of superheavy nuclei
• Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei
• Unified description of rotational-, $\gamma$-, and quasiparticle-band structures in neutron-rich mass $\sim$ 110 region
• Microscopic description of rotation: From ground states to the extremes of ultra-high spin
• Kerman-Onishi conditions in self-consistent tilted-axis-cranking mean-field calculations
• Ground-state and decay properties of neutron-rich 106Nb