Dresden 2000 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HK: Physik der Hadronen und Kerne
HK 22: Kernphysik / Spektroskopie III
HK 22.6: Vortrag
Donnerstag, 23. März 2000, 15:30–15:45, B 68
Conversion Electron Spectroscopy in the 2nd Minimum of 240Pu — •D. Gassmann1, P.G. Thirolf1, D. Habs1, M. Chromik1, A. Görgen2, H. Hübel2, M. Hunyadi3, A. Kraznahorkay3, E. Mergel2, D. Pansegrau4, P. Reiter1, H. Scheit4, and D. Schwalm4 — 1Sektion Physik, LMU München, Am Coulombwall 1, 85748 Garching — 2Universität Bonn, D-53115 Bonn — 3Institute of Nuclear Research, H-4001 Debrecen, Hungary — 4Max Planck Institut für Kernphysik, D-69029 Heidelberg
By using the recoil shadow technique for fission isomers
we were able to measure conversion
electrons from transitions preceding the fission decay of the shape isomer
of 240Pu. The 2nd minimum of 240Pu was populated
by the 238U(α,2n)240Pu reaction and the electrons were
detected by 3 Si-detectors with Mini-Oranges in front of them. From the
measurement of conversion electrons in coincidence with 1.4 · 105
delayed fission decays, a collective β-band at 770 keV (E0-transitions)
and an electron conversion coefficient of αK = 6.3 · 10−3
for the dominating 786 keV γ-transition,
measured by D.Pansegrau et al.[1], could be established. The measured conversion
coefficients allowed for suggestions on the multipolarity of the
γ-transitions. In combination with
our previous measurements [2] we gained new insight on the collective and
single particle excitations in the second minimum in the actinide region.
This work has been supported by the DFG.
[1] D.Pansegrau,Dissertation MPI Heidelberg 1998
[2] A.Kraznahorkay et al.,Phys. Lett. B461 (1999)15-21