The high-spin structures and isomers of the N=81 isotones Xe135 and Ba137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+U238 and (ii) Xe136+Pb208 MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii) in the Xe136+Pt198 MNT reaction employing the γ-ray array GAMMASPHERE in combination with the gas-detector array CHICO, and (iv) via a B11+Te130 fusion-evaporation reaction with the HORUS γ-ray array at the University of Cologne. The high-spin level schemesof Xe135 and Ba137 are considerably extended to higher energies. The 2058-keV (19/2-) state in Xe135 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.

Isomers and high-spin structures in the N=81 isotones Xe 135 and Ba 137 / A. Vogt, B. Birkenbach, P. Reiter, A. Blazhev, M. Siciliano, K. Hadyńska Klȩk, 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. Crespi, M. 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. Napoli, C.J. Pearson, L. Pellegri, Z. 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. 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. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 95:2(2017), pp. 024316.1-024316.17. [10.1103/PhysRevC.95.024316]

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

A. Bracco;F.C.L. Crespi;A. Giaz;S. Leoni;D. Montanari;L. Pellegri;A. Pullia;V. Vandone;
2017

Abstract

The high-spin structures and isomers of the N=81 isotones Xe135 and Ba137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+U238 and (ii) Xe136+Pb208 MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii) in the Xe136+Pt198 MNT reaction employing the γ-ray array GAMMASPHERE in combination with the gas-detector array CHICO, and (iv) via a B11+Te130 fusion-evaporation reaction with the HORUS γ-ray array at the University of Cologne. The high-spin level schemesof Xe135 and Ba137 are considerably extended to higher energies. The 2058-keV (19/2-) state in Xe135 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.
Nuclear and High Energy Physics
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/511730
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