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Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 22: Kernphysik / Spektroskopie III

HK 22.6: Talk

Thursday, March 23, 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. Schwalm41Sektion 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

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