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High-spin structures in Xe 132 and Xe 133 and evidence for isomers along the N=79 isotones

  • Author(s): Vogt, A;
  • Siciliano, M;
  • Birkenbach, B;
  • Reiter, P;
  • Hadyńska-Klȩk, K;
  • Wheldon, C;
  • Valiente-Dobón, JJ;
  • Teruya, E;
  • Yoshinaga, N;
  • Arnswald, K;
  • Bazzacco, D;
  • Blazhev, A;
  • Bracco, A;
  • Bruyneel, B;
  • Chakrawarthy, RS;
  • Chapman, R;
  • Cline, D;
  • Corradi, L;
  • Crespi, FCL;
  • Cromaz, M;
  • De Angelis, G;
  • Eberth, J;
  • Fallon, P;
  • Farnea, E;
  • Fioretto, E;
  • Fransen, C;
  • Freeman, SJ;
  • Fu, B;
  • Gadea, A;
  • Gelletly, W;
  • Giaz, A;
  • Görgen, A;
  • Gottardo, A;
  • Hayes, AB;
  • Hess, H;
  • Hetzenegger, R;
  • Hirsch, R;
  • Hua, H;
  • John, PR;
  • Jolie, J;
  • Jungclaus, A;
  • Karayonchev, V;
  • Kaya, L;
  • Korten, W;
  • Lee, IY;
  • Leoni, S;
  • Liang, X;
  • Lunardi, S;
  • MacChiavelli, AO;
  • Menegazzo, R;
  • Mengoni, D;
  • Michelagnoli, C;
  • Mijatović, T;
  • Montagnoli, G;
  • Montanari, D;
  • Müller-Gatermann, C;
  • Napoli, D;
  • Pearson, CJ;
  • Podolyák, Z;
  • Pollarolo, G;
  • Pullia, A;
  • Queiser, M;
  • Recchia, F;
  • Regan, PH;
  • Régis, JM;
  • Saed-Samii, N;
  • Şahin, E;
  • Scarlassara, F;
  • Seidlitz, M;
  • Siebeck, B;
  • Sletten, G;
  • Smith, JF;
  • Söderström, PA;
  • Stefanini, AM;
  • Stezowski, O;
  • Szilner, S;
  • Szpak, B;
  • Teng, R;
  • Ur, C;
  • Warner, DD;
  • Wolf, K;
  • Wu, CY;
  • Zell, KO
  • et al.
Abstract

The transitional nuclei Xe132 and Xe133 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+Pb208 MNT reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (ii) in the Xe136+Pt198 MNT reaction employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO, and (iii) as an evaporation residue after a Te130(α,xn)Xe134-xn fusion-evaporation reaction employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes are considerably extended above the Jπ=(7-) and (10+) isomers in Xe132 and above the 11/2- isomer in Xe133. The results are compared to the high-spin systematics of the Z=54 as well as the N=78 and N=79 chains. Furthermore, evidence is found for a long-lived (T1/2â‰1μs) isomer in Xe133 which closes a gap along the N=79 isotones. Shell-model calculations employing the SN100PN and PQM130 effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features.

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