The transitional nucleus Xe131 is investigated after multinucleon transfer in the Xe136+Pb208 and Xe136+U238 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 Sn124(B11,p3n)Xe131 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 Xe131 is extended to 5 MeV. A pronounced backbending is observed at ω≈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 Xe129-132 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.
High-spin structure in the transitional nucleus Xe 131: Competitive neutron and proton alignment in the vicinity of the N=82 shell closure / L. Kaya, A. Vogt, P. Reiter, M. Siciliano, B. Birkenbach, A. Blazhev, L. Coraggio, E. Teruya, N. Yoshinaga, K. Higashiyama, K. Arnswald, D. Bazzacco, A. Bracco, B. Bruyneel, L. Corradi, F.C.L. Crespi, G. De Angelis, J. Eberth, E. Farnea, E. Fioretto, C. Fransen, B. Fu, A. Gadea, A. Gargano, A. Giaz, A. Görgen, A. Gottardo, K. Hadyńska-Klȩk, H. Hess, R. Hetzenegger, R. Hirsch, N. Itaco, P.R. John, J. Jolie, A. Jungclaus, W. Korten, S. Leoni, L. Lewandowski, S. Lunardi, R. Menegazzo, D. Mengoni, C. Michelagnoli, T. Mijatović, G. Montagnoli, D. Montanari, C. Müller-Gatermann, D. Napoli, Z. Podolyák, G. Pollarolo, A. Pullia, M. Queiser, F. Recchia, D. Rosiak, N. Saed-Samii, E. Şahin, F. Scarlassara, D. Schneiders, M. Seidlitz, B. Siebeck, J.F. Smith, P.-. Söderström, A.M. Stefanini, T. Steinbach, O. Stezowski, S. Szilner, B. Szpak, C. Ur, J.J. Valiente-Dobón, K. Wolf, K.O. Zell. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 98:1(2018), pp. 014309.1-014309.19. [10.1103/PhysRevC.98.014309]
High-spin structure in the transitional nucleus Xe 131: Competitive neutron and proton alignment in the vicinity of the N=82 shell closure
A. Bracco;F.C.L. Crespi;S. Leoni;A. Pullia;
2018
Abstract
The transitional nucleus Xe131 is investigated after multinucleon transfer in the Xe136+Pb208 and Xe136+U238 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 Sn124(B11,p3n)Xe131 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 Xe131 is extended to 5 MeV. A pronounced backbending is observed at ω≈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 Xe129-132 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.File | Dimensione | Formato | |
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