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

  • Author(s): Vogt, A
  • Birkenbach, B
  • Reiter, P
  • Blazhev, A
  • Siciliano, M
  • Hadyńska-Klȩk, K
  • Valiente-Dobón, JJ
  • Wheldon, C
  • Teruya, E
  • Yoshinaga, N
  • Arnswald, K
  • Bazzacco, D
  • Bowry, M
  • 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
  • Freeman, SJ
  • Fu, B
  • Gadea, A
  • Geibel, K
  • Gelletly, W
  • Gengelbach, A
  • Giaz, A
  • Görgen, A
  • Gottardo, A
  • Hayes, AB
  • Hess, H
  • Hirsch, R
  • Hua, H
  • John, PR
  • Jolie, J
  • Jungclaus, A
  • Kaya, L
  • Korten, W
  • Lee, IY
  • Leoni, S
  • Lewandowski, L
  • 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
  • Pellegri, L
  • Podolyák, Z
  • Pollarolo, G
  • Pullia, A
  • Queiser, M
  • Radeck, F
  • Recchia, F
  • Regan, PH
  • Rosiak, D
  • Saed-Samii, N
  • Şahin, E
  • Scarlassara, F
  • Schneiders, D
  • Seidlitz, M
  • Siebeck, B
  • Sletten, G
  • Smith, JF
  • Söderström, PA
  • Stefanini, AM
  • Steinbach, T
  • Stezowski, O
  • Szilner, S
  • Szpak, B
  • Teng, R
  • Ur, C
  • Vandone, V
  • Warner, DD
  • Wiens, A
  • Wu, CY
  • Zell, KO
  • et al.
Abstract

© 2017 American Physical Society. 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.

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