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

AuthorsVogt, A.; Birkenbach, B.; Reiter, P.; Blazhev, A.; Siciliano, M.; Gadea, Andrés ; Geibel, K.; Gelletly, W.; Jungclaus, Andrea ; Leoni, S.; Lewandowski, L.; Liang, X.; Lunardi, S.
Issue Date15-Feb-2017
PublisherAmerican Physical Society
CitationPhysical Review C 95: 024316 (2017)
AbstractThe 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.
DescriptionA Vogt et al. -- 17 pags., 11 figs., 4 tabs.
Publisher version (URL)https://doi.org/10.1103/PhysRevC.95.024316
Identifiersdoi: 10.1103/PhysRevC.95.024316
issn: 2469-9993
Appears in Collections:(IFIC) Artículos
(CFMAC-IEM) Artículos
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