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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

Triaxiality of neutron-rich ruthenium nuclei studied by lifetime measurements

J S Heines^1,2, V Modamio^1,2, A Görgen^1,2

¹Department of Physics, University of Oslo, Oslo, Norway.

The European Physical Journal. A, Hadrons and Nuclei

|March 5, 2026

Abstract:

The breaking of axial symmetry in nuclei enables otherwise precluded behaviours, making it an interesting phenomenon to study. Experimental fingerprints such as very low-lying $2_{2}^{+}$ states suggest pronounced triaxial deformation for the neutron-rich ruthenium isotopes. Nevertheless, theoretical calculations differ in the description of the triaxial deformation and its evolution with neutron number, making experimental data crucial to understanding it. We investigated the evolution of the degree of triaxiality and $γ$ rigidity in neutron-rich ruthenium isotopes by measuring lifetimes of excited states in $^{108 - 112}$ Ru with the recoil distance Doppler-shift method. The experiment was carried out at the Grand Accélérateur National d'Ions Lourds using the Advanced Gamma Tracking Array coupled to the Variable Mode Spectrometer. We obtained B(E2) values for 29 transitions in the studied nuclei and compared them with fully microscopic symmetry conserving configuration mixing calculations, and phenomenological generalized triaxial rotor and triaxial particle-rotor models. The models generally reproduce the measured transition strengths, and show an increase in triaxiality with neutron number, reaching near maximum triaxiality in $^{112}$ Ru. The results are consistent with a transition from $γ$ soft to $γ$ rigid motion as the neutron number increases.

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