Triaxiality near the 110Ru ground state from Coulomb excitation

D T Doherty ,D Seweryniak,P Humby,P Fallon,M Klintefjord,S Zhu,W Reviol,T Lauritsen,K Kolos,J Srebrny,A Galindo-Uribarri,Clayton Dickerson ,A O Macchiavelli ,D Cline,C W Beausang ,P Napiórkowski ,J Harker ,R Vondrasek,H L Crawford ,J M Allmond ,John L Wood ,G J Lane ,J Libert,D C Radford ,A D Ayangeakaa ,C M Campbell ,H M David ,M Zielińska,R L Varner ,A B Hayes ,J.C Batchelder,F G Kondev ,B Bucher,C J Gross ,A Wiens,R C Pardo ,J.-P Delaroche ,E Padilla‐Rodal ,Matthew R Hendricks ,G Savard,D G Sarantites ,M Girod,M P Carpenter ,W Körten ,R V F Janssens ,E Wilson,C Y Wu

doi:10.1016/j.physletb.2017.01.031

Abstract

A multi-step Coulomb excitation measurement with the GRETINA and CHICO2 detector arrays was carried out with a 430-MeV beam of the neutron-rich 110Ru (t1/2=12s) isotope produced at the CARIBU facility. This represents the first successful measurement following the post-acceleration of an unstable isotope of a refractory element. The reduced transition probabilities obtained for levels near the ground state provide strong evidence for a triaxial shape; a conclusion confirmed by comparisons with the results of beyond-mean-field and triaxial rotor model calculations.

Highlights

A multi-step Coulomb excitation measurement with the GRETINA and CHICO2 detector arrays was carried out with a 430-MeV beam of the neutron-rich 110Ru (t1/2 = 12 s) isotope produced at the CARIBU facility
The reduced transition probabilities obtained for levels near the ground state provide strong evidence for a triaxial shape; a conclusion confirmed by comparisons with the results of beyond-mean-field and triaxial rotor model calculations
The shape is a fundamental property of the atomic nucleus and, while the majority of nuclei are thought to be axially symmetric, triaxial deformation has been a subject of much recent interest in structure studies

Summary

Introduction

The reduced transition probabilities obtained for levels near the ground state provide strong evidence for a triaxial shape; a conclusion confirmed by comparisons with the results of beyond-mean-field and triaxial rotor model calculations.

Results

Conclusion