Isomers and high-spin structures in the N = 81 isotones 135 Xe and 137 Ba

A. Vogt, B. Birkenbach, A Blazhev, M. Siciliano, K Hadynska-Klek, J. J. Valiente-Dobon, C Wheldon, E. Teruya, N Yoshinaga, K. Arnswald, D. Bazzacco, M. Bowry, A Bracco, B Bruyneel, R. S. Chakrawarthy, R Chapman, D Cline, L Corradi, F. C. L. Crespi, M CromazG. de Angelis, J. Eberth, P. Fallon, E. Farnea, E. Fioretto, Sean Freeman, B. Fu, A Gadea, K. Geibel, W Gelletly, A. Gengelbach, A. Giaz, A Gorgen, A Gottardo, A. B. Hayes, H Hess, Rosemarie Hirsch, H Hua, P. R. John, J Jolie, A Jungclaus, L. Kaya, W Korten, I Y Lee, S Leoni, L. Lewandowski, X. Liang, S Lunardi, A. O. MacChiavelli, R Menegazzo, D. Mengoni, C. Michelagnoli, T. Mijatovic, G. Montagnoli, D. Montanari, C. Muller-Gatermann, D Napoli, C. J. Pearson, L. Pellegri, Zs. Podolyak, G. Pollarolo, A Pullia, M. Queiser, F. Radeck, F. Recchia, P. H. Regan, D. Rosiak, N. Saed-Samii, E. Sahin, F. Scarlassara, D. Schneiders, M. Seidlitz, B. Siebeck, G Sletten, J. F. Smith, P. A. Söderström, A. M. Stefanini, T. Steinbach, O Stezowski, S Szilner, B. Szpak, R Teng, C Ur, V. Vandone, D D Warner, A. Wiens, C. Y. Wu, K. O. Zell

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    The high-spin structures and isomers of the N=81 isotones 135Xe and137Ba are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in 136 Xe+238 U and (ii) 136 Xe + 208 Pb MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii) in the 136 Xe+ 198PtMNT reaction employing the γ-ray array GAMMASPHERE in combination with the gas-detector array CHICO, and (iv) via a 11 B+130Te fusion-evaporation reaction with the HORUS γ-ray array at the University of Cologne. The high-spin level schemesof 135Xe and 137 Ba are considerably extended to higher energies. The 2058-keV (19/2−) state in 135 Xe is identified as an isomer, closing a gap in the systematics along the N=81 isotones. Its half-life is measured to be 9.0(9) ns, corresponding to a reduced transition probability of B(E2,19/2−→15/2−)=0.52(6 ) W.u. The experimentally deduced reduced transition probabilities of the isomeric states are compared to shell-model predictions. Latest shell-model calculations reproduce the experimental findings generally well and provide guidance to the interpretation of the new levels.
    Original languageEnglish
    Article number024316
    JournalPhysical Review C (Nuclear Physics)
    Early online date15 Feb 2017
    Publication statusPublished - 2017


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