gfactors of the first2+states in the transitional92,94,96,98,100Moisotopes and the onset of collectivity

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Abstract

The g factors of the ${2}_{1}^{+}$ states of the stable, even-even Mo isotopes ${}^{92,94,96,98,100}\mathrm{Mo}$ were measured using the transient field method. While ${}^{92}{\mathrm{Mo}}_{50}$ has a g factor consistent with that of the $\ensuremath{\pi}{g}_{9/2}^{2}$ configuration, the g factor of ${}^{94}\mathrm{Mo}$ is about 60% of the hydrodynamic model value, $Z/A.$ As further pairs of neutrons are added, the heavier isotopes ${}^{96,98,100}\mathrm{Mo}$ show a monotonic increase in ${g(2}^{+})$ to values that exceed $Z/A$ for ${}^{98}\mathrm{Mo}$ and ${}^{100}\mathrm{Mo}.$ The systematic behavior of the ${g(2}_{1}^{+})$ values for the Mo isotopes, as one moves away from the neutron shell closure at $N=50,$ is compared with the shell model, a collective model with pairing corrections and IBM-2 calculations.

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