Revisiting anomalous B(E2;41+→21+)/B(E2;21+→01+) values in Ru98 and Pt180

Abstract

Recently, a set of nine nonmagic nuclei with anomalous values of the B(E2) ratio B4/2≡B(E2;41+→21+)/B(E2;21+→01+) < 1 were identified. Such values are outside the range allowed by current collective models. In the present work, the B(E2;41+→21+) values for two of these nuclei, Ru98 and Pt180, were re-measured to determine if the current literature values for these nuclei are correct. Ru98 was studied in a Al27(Ru98,Ru98*) Coulomb excitation experiment in inverse kinematics, while the lifetime of the 41+ state in Pt180 was measured in a Sn122(Ni62, 4n)Pt180 recoil distance method (RDM) experiment. For both nuclei, the remeasured B4/2 values are well above 1, removing the deviations from collective models. Show more