Observation of multiphonon transverse wobbling in 133Ba

The low-lying negative parity states in the Ba-133 nucleus have been investigated using the Sn-124(C-13, 4n gamma)Ba-133 reaction at E-lab = 48 MeV. With the addition of new gamma-transitions, n(omega)= 0, 1, 2 wobbling bands were identified in this nucleus. The angular correlations and linear polarization measurements have been performed to confirm the spin and parity of the states. Predominant E2 character was obtained for the inter-linking Delta I =1 transitions between the successive phonon (Delta n(omega) = 1) wobbling bands. The transverse nature of the wobbling bands is concluded on the basis of observed decreasing behavior of the wobbling frequency with increasing spin. The quasiparticle triaxial rotor model calculations are found to be in agreement with the experimentally determined wobbling frequency and the transition probability ratios. This letter reports the first observation of transverse wobbling mode associated with a hole-like quasiparticle. (C) 2021 Published by Elsevier B.V.

Automated summary

The low-lying negative parity states in the Ba-133 nucleus were studied, revealing the presence of wobbling bands with transverse nature. The experimental results confirmed the predominant E2 character in the inter-linking transitions between wobbling bands with adjacent phonons.