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HK: Physik der Hadronen und Kerne
HK 10: Poster Session: Nuclear Physics/Spectroscopy
HK 10.3: Poster
Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie
Photo-induced population of the h 11/2 isomers in 135,137Ba — •H. von Garrel1, D. Belic1, P. von Brentano2, C. Fransen2, A. Gade2, U. Kneissl1, C. Kohstall1, M. Kreutz1, A. Linnemann2, H.H. Pitz1, M. Scheck1, F. Stedile1, and V. Werner2 — 1Institut für Strahlenphysik, Universität Stuttgart, Stuttgart — 2Institut für Kernphysik, Universität zu Köln, Köln
Photoactivation and photon scattering experiments have been performed at the Stuttgart bremsstrahlung facility on 135,137Ba to investigate the nuclear structure and isomer population near the N=82 shell closure. The combination of these methods can give valuable model independent information, especially lifetimes of the populating levels and the branching ratio Γiso/Γ0 [1]. For 135Ba in the photoactivation experiments five intermediate states (IS) have been found in the energy range 1.3-2.6 MeV populating the 28.7 h isomer at 268 keV. For three of them dipole-excited states can be suggested from the NRF measurements with 2.5 MeV bremsstrahlung endpoint energy. For 137Ba three IS have been found in photoactivation of the 662 keV, 2.55 min. isomer in the energy range of 2.2-3.2 MeV. From NRF also three levels can be ascribed to these IS. The results of the measurements are discussed and compared with theoretical calculations.
[1] D. Belic et al., Nucl. Instr. a. Meth. A 463 (2000) 26-41.