Comprehensive studies of low-spin collective excitations in94Mo
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Abstract
Excited low-spin states in ${}^{94}\mathrm{Mo}$ have been studied extensively with a combination of $\ensuremath{\gamma}$-ray spectroscopic techniques. We have performed photon scattering experiments, $\ensuremath{\gamma}\ensuremath{\gamma}$ coincidence measurements following the ${\ensuremath{\beta}}^{+}$ decay of ${}^{94}{\mathrm{Tc}}^{\mathrm{m}},$ in-beam $\ensuremath{\gamma}\ensuremath{\gamma}$ coincidence studies with the reaction ${}^{91}\mathrm{Zr}(\ensuremath{\alpha}{,n)}^{94}\mathrm{Mo},$ and ${}^{94}\mathrm{Mo}{(n,n}^{\ensuremath{'}}\ensuremath{\gamma})$ measurements. These experiments yielded detailed information about the low-spin level scheme of ${}^{94}\mathrm{Mo}.$ From measured lifetimes, branching ratios, and multipole mixing ratios, many absolute transition strengths were determined. These data permitted the interpretation of several low-spin states in terms of collective excitations, that are not fully symmetric with respect to the proton-neutron degree of freedom, the so-called mixed-symmetry (MS) states: The one-phonon ${2}^{+}$ MS state and three members of an expected multiplet of two-phonon MS states were identified from absolute $M1$ and $E2$ transition strengths. The data also enable us to identify several proton-neutron-symmetric multiphonon states.
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