g factor of the $$12^+$$ 12 + K -isomer in $$^{174}$$ 174 W
2020
The g factor of the $$12^+$$
K-isomer in $$^{174}$$
W has been measured by means of the time-differential perturbed angular distribution technique as $$g(12^+)=+0.304(11)$$
. In addition, the half-life of the isomer has been remeasured as $$T_{1/2}(12^+)=124(8)$$
ns, in agreement with the literature value and confirming the anomalous hindrance F of the E2 transition to the $$10^+$$
level of the ground state band with respect to the $$\gamma $$
-tunnelling model prediction. The measured g factor has been compared with estimates based on experimental g factors from odd-mass isotopes in the same mass region and with Nilsson model calculations. The results establish unique features of the $$12^+$$
K-isomer in $$^{174}$$
W, which can possess a non-pure intrinsic configuration and/or can be characterised by values of the intrinsic quadrupole moment $$Q_0$$
and the rotational g factor $$g_R$$
significantly different with respect to the majority of K-isomers at mass $$A \approx 180$$
.
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