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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, P.; Siciliano, M.; Birkenbach, B.; Blazhev, A.; Coraggio, L.; Teruya, E.; Yoshinaga, N.; Higashiyama, K.; Arnswald, K.; Bazzacco, D.; Bracco, A.; Bruyneel, B.; Corradi, L.; Crespi, F. C. L.; de Angelis, G.; Eberth, J.; Farnea, E.; Fioretto, E.; Fransen, C.; Fu, B.; Gadea, A.; Gargano, A.; Giaz, A.; Gorgen, A.; Gottardo, A.; Hadynska-Klek, K.; Hess, H.; Hetzenegger, R.; Hirsch, R.; Itaco, N.; John, P. R.; Jolie, J.; Jungclaus, A.; Korten, W.; Leoni, S.; Lewandowski, L.; Lunardi, S.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Mijatović, Tea; Montagnoli, G.; Montanari, D.; Muller-Gatermann, C.; Napoli, D.; Podolyak, Zs.; Pollarolo, G.; Pullia, A.; Queiser, M.; Recchia, F.; Rosiak, D.; Saed-Samii, N.; Sahin, E.; Scarlassara, F.; Schneiders, D.; Seidlitz, M.; Siebeck, B.; Smith, J. F.; Soderstrom, P.-A.; Stefanini, A. M.; Steinbach, T.; Stezowski, O.; Szilner, Suzana; Szpak, B.; Ur, C.; Valiente-Dobon, J. J.; Wolf, K.; Zell, K. O. (2018) High-spin structure in the transitional nucleus 131Xe: Competitive neutron and proton alignment in the vicinity of the N=82 shell closure. Physical review. C, 98 (1). ISSN 2469-9985

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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 ℏω≈0.4MeV 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 π0h11/2 orbital is found to be decisive for the description of the observed backbending phenomenon.

Item Type: Article
Uncontrolled Keywords: multinucleon transfer; AGATA gamma array; Large-scale shell-model calculations
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Depositing User: Sofija Konjević
Date Deposited: 10 Aug 2018 08:57
DOI: 10.1103/PhysRevC.98.014309

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