Search for the origin of wobbling motion in the A≈130 region: The case of Xe131

Abstract

In-beam γ -ray spectroscopy of 131 Xe was carried out to study the structure of the intruder νh 11/2 band. Excited states were populated via an α-induced fusion-evaporation reaction at E α = 38 MeV. Inspection of γ γ -coincidence data resulted in the identification of a new rotational sequence. Based on the systematics of excitation energy, assigned spin-parity, decay pattern, and the electromagnetic character of the interband I = 1 γ transitions, this sequence is proposed as the unfavored signature partner of the νh 11/2 band. The structure of this band is further illuminated in the light of the triaxial particle rotor model (TPRM). The possibility of wobbling excitation in N = 77 Xe-Ba-Ce isotones was explored in a systematic manner.

Possible wobbling phenomenon in Xe125

“…Therefore, 125 Xe appears to be stabilized with a triaxial deformation of γ = 27 • (according to the TPSM calculation). Thus, this nucleus shows properties of longitudinal wobbling and this observation of wobbling in 125 Xe further strengthens the suggested correlation between wobbling motion and R E or Q 0 , as claimed by Chakraborty et al [26].…”

“…The transverse wobbling charac-034301-2 teristics proposed in some of the nuclei are debatable [25]. In a recent publication on 131 Xe by Chakraborty et al, [26], the authors concluded that odd-A nuclei, where a wobbling band has been observed, are mostly surrounded by two even-even nuclei with R E 2.3 and Q 0 2.6 b (where…”