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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 17: Kernphysik/Spektroskopie

HK 17.4: Talk

Monday, March 7, 2005, 15:00–15:15, TU MA004

Gamma spectroscopy of 236U — •T. Striepling1, P. Reiter1, S. Binder1, P. Bringel2, B. Bruyneel1, M. Chatzistamatiou1, J. Eberth1, G. Gersch1, H. Hess1, H. Hübel2, M. Lauer3, R. Lutter4, C. Miller1, T. Morgan4, A. Neusser2, W. Schwerdtfeger4, I. Stefanescu1, P. Thirolf4, N. Warr1, D. Weisshaar1, and A. Wiens11IKP, Uni Köln — 2ISKP, Uni. Bonn — 3MPI-K, Heidelberg — 4LMU München

A two weeks long, high statistics experiment at the Cologne tandem accelerator has been conducted to study γ-decays of 236U. The motivation of this measurement is the search for unknown γ-decaying superdeformed states of vibrational and single particle character. Moreover it allows for a high resolution study of the delayed γ-decay of the shape isomeric ground state of the second minimum back into the normal deformed configuration. Inside the MINIBALL spectrometer a Δ EE Si detector telescope was used to identify protons after 235U(d,p) reactions at Elab=11 MeV and to suppress the overwhelming background from prompt fission events. The beam pulse distance of Δ t = 400 ns was adapted to the half live of the isomer t1/2=115 ns. More than 2.5 · 106 photo peak counts in the ground state transitions from the first normaldeformed 1 levels were recorded. With the known isomer ratio for the reaction [1] hundreds of photo peak counts are expected by gating on delayed gamma cascades depopulating the second minimum. The results of the ongoing analysis will be presented.
∗ Supported by the German BMBF(06 K-167).

[1] J.Schirmer,et al., Phys. Rev. Lett. 63 2196 (1989)

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