Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 16: Nuclear Structure/Spectroscopy II

HK 16.9: Vortrag

Dienstag, 9. März 2004, 18:00–18:15, A

Search for Hyperdeformation in ¹²⁶Ba^* — •A.K. Singh¹, A. Al-Khatib¹, A. Bürger¹, P. Bringel¹, H. Hübel¹, A. Neußer¹, G.B. Hagemann², B. Herskind², C.R. Hansen², G. Sletten², D. Curien³, A. Maj⁴, A. Lopez-Martens⁵, A. Bracco⁶, P. Fallon⁷, and B.M. Nyakó⁸ — ¹HISKP, Univ. Bonn, Germany — ²NBI, Copenhagen, Denmark — ³IReS, Strasbourg, France — ⁴IFJ, Krakow, Poland — ⁵CSNSM, Orsay, France — ⁶Univ. Milano, Italy — ⁷LBNL, Berkely, USA — ⁸ATOMIKI, Debrecen, Hungary

A previous search for hyperdeformation in ¹²⁶Ba using the GAMMASPHERE array at Berkeley led to the observation of a narrow ridge structure in the γ-ray continuum corresponding to rotational bands with a large moment of inertia. This motivated us to search for hyperdeformation with the EUROBALL spectrometer at IReS, Strasbourg. Two experiments were performed using the ⁶⁴Ni + ⁶⁴Ni reaction at beam energy of 255 and 261 MeV. The first experiment was performed with EUROBALL in combination with the large volume BaF₂ detector array HECTOR to measure GDR transitions between the highly deformed states. The second experiment was done in combination with the charged particle detector DIAMANT for a better selection of reaction channels. The search for hyperdeformed structures both in the continuum and in the discrete γ-ray spectrum is going on. So far no convincing discrete-line bands with appropriate statistical significance have been found. * Supported by BMBF (06 BN 907), (Hu 325/10) and EU