Göttingen 1997 – wissenschaftliches Programm
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HK: Hadronen und Kerne
HK 43: Kernspektroskopie, schwere Kerne V
HK 43.3: Vortrag
Mittwoch, 26. März 1997, 15:00–15:15, HS F
Conversion electron measurements in the 2nd minimum of 240Pu — •D. Gassmann1, P. Thirolf1, D. Habs1, C. Fischbeck1, H. Hübel2, M. Hunyadi3, O. Kester1, A. Kraznahorkay3, K.E.G. Löbner1, D. Pansegrau4, D. Rudolph1, K. Rudolph1, B. Schulze2, D. Schwalm4, J. vanKlinken5, H.J. Wollersheim6, and C. Zotti1 — 1LMU München, D-85748 Garching — 2Universität Bonn, D-53115 Bonn — 3Institute of Nuclear Research, H-4001 Debrecen, Hungary — 4Max Planck Institut für Kernphysik, D-69029 Heidelberg — 5KVI Groningen, the Netherlands — 6GSI, D-64220 Darmstadt
γ-spectroscopic measurements have been made in the 2nd minima of
240Pu with the new Cluster detectors[1]. The most probable interpretations
of the level-scheme suggest the presence of strong E0-transitions.
Therefore we set up a new experiment at the Munich Tandem, where
we populated the shape isomer of 240Pu by the 238U(α,2n)
-reaction (Eα=25MeV). We measured the prompt conversion electrons
in coincidence with delayed fission fragments. By using a shadow techniques we could
separate prompt and delayed fission. To reduce the huge background
from δ-electrons we installed Mini-Oranges with a sharp
transmission curve peaking around 700keV in front of our electron detectors.
First data and results will be presented.
[1] D.Pansegrau et al., DPG Frühjahrstagung 1996, Stutgart