# Triaxiality of neutron-rich ruthenium nuclei studied by lifetime measurements

## TL;DR

This study investigates the triaxial deformation in neutron-rich ruthenium isotopes using lifetime measurements to understand nuclear shape evolution.

## Contribution

The paper provides new experimental data on triaxiality in neutron-rich ruthenium isotopes and compares it with theoretical models.

## Key findings

- B(E2) values for 29 transitions were measured in ruthenium isotopes 108-112Ru.
- Triaxiality increases with neutron number, reaching near maximum in 112Ru.
- The results suggest a transition from γ-soft to γ-rigid motion with increasing neutron number.

## 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 \documentclass[12pt]{minimal}
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\begin{document}$$2_2^+$$\end{document}22+ 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 \documentclass[12pt]{minimal}
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\begin{document}$$\gamma $$\end{document}γ rigidity in neutron-rich ruthenium isotopes by measuring lifetimes of excited states in \documentclass[12pt]{minimal}
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\begin{document}$$^{108-112}$$\end{document}108-112Ru 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 \documentclass[12pt]{minimal}
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\begin{document}$$^{112}$$\end{document}112Ru. The results are consistent with a transition from \documentclass[12pt]{minimal}
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\begin{document}$$\gamma $$\end{document}γ soft to \documentclass[12pt]{minimal}
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\begin{document}$$\gamma $$\end{document}γ rigid motion as the neutron number increases.