High-spin structure in the transitional nucleus 1 131Xe: Competitive neutron and proton alignment in the vicinity of the N = 82 shell closure
2018
The transitional nucleus 131Xe is investigated after multinucleon transfer (MNT) in the
136Xe+208Pb and 136Xe+238U reactions employing the high-resolution Advanced GAmma Tracking
Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro,
Italy and as an elusive reaction product in the fusion-evaporation reaction 124Sn(11B,p3n)
131Xe
employing the HORUS γ-ray array coupled to a double-sided silicon strip detector (DSSSD) at
the University of Cologne, Germany. The level scheme of 131Xe is extended to 5 MeV. A pronounced
backbending is observed at ~ω ≈ 0.4 MeV along the negative-parity one-quasiparticle
νh11/2(α = −1/2) band. The results are compared to the high-spin systematics of the Z = 54
isotopes and the N = 77 isotones. Large-scale shell-model calculations (LSSM) employing the
PQM130, SN100PN, GCN50:82, SN100-KTH and a realistic effective interaction reproduce the experimental
findings and provide guidance to elucidate the structure of the high-spin states. Further
calculations in 129−132Xe provide insight into the changing nuclear structure along the Xe chain
towards the N = 82 shell closure. Proton occupancy in the π 0h11/2 orbital is found to be decisive
for the description of the observed backbending phenomenon.
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