Revisiting anomalousB(E2;41+→21+)/B(E2;21+→01+)values inRu98andPt180

Abstract

Recently, a set of nine nonmagic nuclei with anomalous values of the $B(E2)$ ratio ${B}_{4/2}\ensuremath{\equiv}B(E2;{4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})/B(E2;{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ 1 were identified. Such values are outside the range allowed by current collective models. In the present work, the $B(E2;{4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ values for two of these nuclei, $^{98}\mathrm{Ru}$ and $^{180}\mathrm{Pt}$, were re-measured to determine if the current literature values for these nuclei are correct. $^{98}\mathrm{Ru}$ was studied in a $^{27}\mathrm{Al}$($^{98}\mathrm{Ru}$,$^{98}\mathrm{Ru}$${}^{*}$) Coulomb excitation experiment in inverse kinematics, while the lifetime of the ${4}_{1}^{+}$ state in $^{180}\mathrm{Pt}$ was measured in a $^{122}\mathrm{Sn}$($^{62}\mathrm{Ni}$, $4n$)$^{180}\mathrm{Pt}$ recoil distance method (RDM) experiment. For both nuclei, the remeasured ${B}_{4/2}$ values are well above 1, removing the deviations from collective models.