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HK: Physik der Hadronen und Kerne

HK 39: Nuclear Physics / Spectroscopy VI

HK 39.2: Vortrag

Donnerstag, 14. März 2002, 14:30–14:45, B

Search for triaxial superdeformation in ¹⁷⁰Hf* — •A. Neusser¹, S. Bhattacharya², P. Bringel¹, D. Curien³, O. Deveraux³, J. Domscheit¹, G.B. Hagemann⁴, F. Hannachi⁵, H. Hübel¹, D.R. Jensen⁴, A. Lopez-Martens⁵, E. Mergel¹, N. Nenoff¹, and A.K. Singh¹ — ¹Institut für Strahlen- und Kernphysik, Univ. Bonn — ²SINP, Calcutta — ³IReS, Strasbourg — ⁴Niels Bohr Institute, Copenhagen — ⁵CSNSM, Orsay

Triaxial superdeformation (TSD) has recently been established in Lu and Hf isotopes in the mass 165 region. In this work we report on the first evidence for TSD in ¹⁷⁰Hf. High-spin states in ¹⁷⁰Hf have been populated at the Vivitron accelerator of IReS, Strasbourg, using the reaction ¹²⁴Sn(⁵⁰Ti,4n) at 216 MeV beam energy. Gamma-ray coincidences were detected with the EUROBALL spectrometer. A preliminary analysis of the coincidence data leads to an extension of all known normal-deformed (ND) bands in ¹⁷⁰Hf to higher spins. In addition, one new ND band has been found. First results of the search for TSD in ¹⁷⁰Hf revealed a band with similar characteristics as the TSD bands in neighbouring ¹⁶⁸Hf.

*Work supported by BMBF, Germany (Contract no. 06 BN 907) and by DFG (Contract no. HU 325/10)