Quadrupole Moment of the Second2+State ofW184,186

Abstract

We have performed a thick-target particle-$\gamma$ coincidence experiment to measure $q\left(2^{+\prime }\right)$, the quadrupole moment of the second $2^{+}$ state, of ${}_{}{}^{184,186}{}_{}{}^{}\mathrm{W}$. We have also determined $q\left(2^{+\prime }\right)$ of ${}_{}{}^{186}{}_{}{}^{}\mathrm{W}$ by an independent method involving particle spectroscopy. Neither the rotation-vibration nor the asymmetric rotor model can explain the results. Kumar-Baranger calculations agree with the trend.