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. Wiens¹ — ¹IKP, 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 E−E Si detector telescope was used to identify protons after ²³⁵U(d,p) reactions at E_lab=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 t_1/2=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)