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

A. Vogt, B. Birkenbach, P. Reiter, A. Blazhev, M. Siciliano, K. Hadynska-Klek, J. J. Valiente-Dobón, 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. CrespiM. Cromaz, G. de Angelis, J. Eberth, P. Fallon, E. Farnea, E. Fioretto, S. J. Freeman, B. Fu, A. Gadea, K. Geibel, W. Gelletly, A. Gengelbach, A. Giaz, A. Görgen, A. Gottardo, A. B. Hayes, H. Hess, R. 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. Mijatović, G. Montagnoli, D. Montanari, C. Müller-Gatermann, D. R. Napoli, C. J. Pearson, L. Pellegri, Zs. Podolyák, G. Pollarolo, A. Pullia, M. Queiser, F. Radeck, F. Recchia, P. H. Regan, D. Rosiak, N. Saed-Samii, E. Şahin, 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 and 137Ba are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in 136Xe+238U and (ii) 136Xe+208Pb MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii) in the 136Xe+198Pt MNT reaction employing the γ-ray array GAMMASPHERE in combination with the gas-detector array CHICO, and (iv) via a 11B+130Te fusion-evaporation reaction with the HORUS γ-ray array at the University of Cologne. The high-spin level schemes of 135Xe and 137Ba are considerably extended to higher energies. The 2058-keV (19/2−) state in 135Xe 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
Number of pages17
JournalPhysical Review C
Publication statusPublished - 15 Feb 2017


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