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High-spin structure in the transitional nucleus 131Xe: Competitive neutron and proton alignment in the vicinity of the N=82 shell closure

Kaya, L.; Vogt, A.; Reiter, Peter; Siciliano, M.; Birkenbach, B.; Blazhev, A; Coraggio, J.L.; Teruya, E.; Yoshinaga, N.; Higashiyama, K.; Arnswald, K.; Bazzacco, Dino; Bracco, Angela; Bruyneel, Bart; Corradi, L; Crespi, F.C.L.; De Angelis, G.; Eberth, J.; Farnea, Enrico; Fioretto, E.; Fransen, Christoph; Fu, B.; Gadea, Andres; Gargano, A; Giaz, Agnese; Görgen, Andreas; Gottardo, Andrea; Hadynska-Klek, Katarzyna; Hess, H.; Hetzenegger, R.; Hirsch, R.; Itaco, N; John, P.R.; Jolie, J; Jungclaus, A.; Korten, Wolfram; Leoni, Silvia; Lewandowski, L.; Lunardi, Santo; Menegazzo, R.; Mengoni, D.; Michelagnoli, Caterina; Mijatovic, T.; Montagnoli, G; Montanari, D.; Müller-Gatermann, C.; Napoli, D.R.; Podolyák, Zsolt; Pollarolo, G; Pullia, A.; Queiser, M.; Recchia, Francesco; Rosiak, D.; Saed-Samii, N.; Sahin, Eda; Scarlassara, F; Schneiders, D.; Seidlitz, M; Siebeck, B.; Smith, J.F.; Söderström, Pär Anders; Stefanini, AM; Steinbach, T; Stezowski, O; Szilner, Suzana; Szpak, B.; Ur, C.A.; Valiente-Dobón, Jose Javier; Wolf, K.; Zell, KO
Journal article; PublishedVersion; Peer reviewed
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PhysRevC.98.014309.pdf (1010.Kb)
Year
2018
Permanent link
http://urn.nb.no/URN:NBN:no-69798

CRIStin
1644500

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  • Fysisk institutt [2516]
  • CRIStin høstingsarkiv [16985]
Original version
Physical Review C. 2018, 98 (1):014309, DOI: http://dx.doi.org/10.1103/PhysRevC.98.014309
Abstract
The transitional nucleus 131Xe is investigated after multinucleon transfer in the 136Xe + 208Pb and 136Xe + 238U reactions employing the high-resolution Advanced γ -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 High-efficiency Observatory for γ -Ray Unique Spectroscopy (HORUS) γ -ray array coupled to a double-sided silicon strip detector at the University of Cologne, Germany. The level scheme of 131Xe is extended to 5 MeV. A pronounced backbending is observed at hω¯ ≈ 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 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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