Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 29: Kernphysik/Spektroskopie IV
HK 29.3: Vortrag
Mittwoch, 19. März 2003, 14:45–15:00, A
Nuclear-Resonance-Fluorescence Experiments on 98Mo and 100Mo ⋆ — •G. Rusev1,2, R. Schwengner1, F. Dönau1, L. Käubler1, S. Mallion1, K.D. Schilling1, A. Wagner1, H. von Garrel3, U. Kneissl3, C. Kohstall3, M. Kreutz3, H.H. Pitz3, M. Scheck3, F. Stedile3, L.K. Kostov2, P. von Brentano4, J. Jolie4, A. Linnemann4, N. Pietralla4, and V. Werner4 — 1Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, Dresden — 2Institute for Nuclear Research and Nuclear Energy, Sofia — 3Institut für Strahlenphysik, Universität Stuttgart — 4Institut für Kernphysik, Universität Köln
Nuclear-resonance-fluorescence (NRF) experiments on 98Mo and
100Mo
were carried out at the bremsstrahlung facility of the Stuttgart Dynamitron
accelerator at electron energies of 3.2, 3.3, 3.4 and 3.8 MeV. Samples of
about 2 g of highly enriched 98Mo and 100Mo, respectively, were
used
in the NRF measurements. Scattered photons were measured with three HPGe
detectors placed at 90∘, 127∘ and 150∘,
respectively, to the incident photon beam.
We observed dipole excitations between 2.9 and 3.7 MeV and several
branchings
to known low-lying states. A specific feature of both nuclei is a
deexcitation
of J = 1 states to the first excited 0+ states. This is one of the
first
observations of transitions from dipole states to 0+ intruder states.
Our first NRF experiments at the ELBE accelerator at Rossendorf use
electron
energies up to 12 MeV and focus on dipole excitations in 98Mo and
100Mo at higher energies.
⋆ Supported by the DFG under contracts Do 466/1-1 and Pi 393/1-2.