Three-quasineutron 3-band in 127Xe

Abstract

Structures of negative parity multi-quasiparticle states in 127Xe have been investigated through in-beam 3-ray spectroscopy. Excited states were populated via the 122Sn(9Be, 4n 3)127Xe fusion-evaporation reaction at E beam = 48 MeV. Two new negative parity bands have been identified and their structures have been discussed using the triaxial projected shell model (TPSM) approach. One of the bands is established above the I π = 27/2- state at 3702 keV and based on the experimental inferences and TPSM results, this band is interpreted as a 3-band built on a three-quasineutron configuration. The second sequence, found above I π = 31/2- state at 4848 keV, is proposed to have a two-proton aligned configuration ( νh11/2⨂πh11/22 ), considering the properties of this band with the neighbouring isotopes. The analysis of the TPSM wave function substantiates the proposed interpretation of this band. © 2023 IOP Publishing Ltd.