Abstract
One of the main research themes in quantum many-body systems is the emergence of collective features from microscopic degrees of freedom. Using the microscopic approach of the triaxial projected shell model, the authors demonstrate that admixing a few quasiparticle excitations into the vacuum configuration with a fixed triaxiality parameter $\ensuremath{\gamma}$ provides a quantitative description of the shape fluctuations of the $\ensuremath{\gamma}$-soft nucleus ${}^{104}$Ru. The collective features are elucidated using the quadrupole shape invariant analysis, and also the staggering phase classification of the $\ensuremath{\gamma}$ band.
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