Rigid triaxial deformation in $^{76}$Ge

The possible existence of stable triaxial ground-state deformation in even-even nuclei has been a subject much interest in nuclear structure research. This interest has been motivated largely by the longstanding issue of whether axially-asymmetric nuclei are characterized by rigid or soft triaxiality in their ground-state configurations. Indeed, while signatures of static triaxial deformation has long been established at high angular momenta, the experimental observation of rigid triaxiality at low-spin has remained a challenge. In this study, experimental evidence for static triaxial ground-state deformation in $^{76}$Ge will be presented from a model-independent perspective. This will be complemented by results of large-scale shell model calculations and multi-configuration mixing calculations carried out within the framework of the triaxial rotor model.