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HK: Physik der Hadronen und Kerne

HK 16: Kernphysik/Spektroskopie II

HK 16.5: Talk

Tuesday, March 18, 2003, 17:00–17:15, A

Search for Hyperdeformation in ¹²⁶Ba^* — •A.K. Singh¹, P. Bringel¹, H. Hübel¹, A. Neußer¹, G.B. Hagemann², B. Herskind², D.R. Jensen², G. Benzoni³, A. Bracco³, F. Camera³, S. Leoni³, P. Mason³, B. Million³, O. Wieland³, M. Brekiesz⁴, M. Kmiecik⁴, A. Maj⁴, F. Hannachi⁵, P. Bednarczyk⁶, D. Curien⁶, S. Ødegard⁷, C. Petrache⁸, and D. Petrache⁸ — ¹HISKP, Univ. Bonn — ²NBI, Denmark — ³Univ. Milano, Italy — ⁴Univ. Krakow, Poland — ⁵CSNSM,Orsay, France — ⁶IReS, Strasbourg, France — ⁷Univ. Oslo, Norway — ⁸Univ. Camerino, Italy

A search for hyperdeformation in ¹²⁶Ba using the GAMMASPHERE array at Berkeley led to an indication of a narrow ridge structure in the γ-ray continuum. This motivated a new experiment to populate high-spin states in ¹²⁶Ba using the ⁶⁴Ni + ⁶⁴Ni reaction. A combination of the BaF₂ array HECTOR and the EUROBALL array was used to measure high-fold γ-ray coincidences. The analysis shows, for the first time, low-lying GDR components at 6-14 MeV, most probably built on states in the transition region to very elongated Jacobi shapes at spins I ≃ 66-72. To look for very weak discrete γ-ray transitions of hyperdeformed bands, an experiment is planned with the full EUROBALL spectrometer. * Supported by BMBF (06 BN 907) and DFG (Hu 325/10)