Abstract
A recently developed technique for fast timing measurements using \ensuremath{\beta}-\ensuremath{\gamma}-\ensuremath{\gamma} coincidences with plastic, ${\mathrm{BaF}}_{2}$ and Ge detectors, respectively, has been used to measure lifetimes in the range 5--1500 ps in the neutron-rich nuclei $^{97}\mathrm{Sr}$, $^{97}\mathrm{Y}$, and $^{97}\mathrm{Zr}$. The results for $^{97}\mathrm{Y}$ are interpreted in terms of quadrupole vibrational excitations. For $^{97}\mathrm{Sr}$ the experimental data suggest the coexistence of spherical/vibrational and deformed states and allow the extraction of mixing matrix elements between them. A quadrupole moment of \ensuremath{\Vert}${\mathit{Q}}_{0}$\ensuremath{\Vert}=3.5(4) e b for the deformed states in $^{97}\mathrm{Sr}$ has been deduced.
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