Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 43: Nuclear Structure/Spectroscopy VII

HK 43.8: Talk

Thursday, March 11, 2004, 18:45–19:00, A

Properties of the first excited K^π=0⁺ band in ¹⁶⁰Dy — •G. Gersch¹, J. Eberth¹, C. Günther², H. Hess¹, I. Stefanescu¹, T. Steinhardt¹, O. Thelen¹, N. Warr¹, and D. Weisshaar¹ — ¹Institute for nuclear physics, University of Cologne, Germany — ²Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Germany

The nucleus ¹⁶⁰Dy was studied in the β-decay of ¹⁶⁰Er using the highly efficient MINIBALL spectrometer. The main aim of the investigation was to identify a possible decay of the lowest excited K^π=0⁺ band to the γ band. Calculations within the IBA model predict energy and strength of this decay [1]. In spite of the excellent quality and statistics of the data no candidate for the postulated decay could be found. The upper limit of the intensity of such a transition was estimated to be 0.024 % of the intensity of the 197 keV transition of the γ band. These results do not support the interpretation of the first excited K^π=0⁺ band as a phonon excitation of the γ band [1].

The good quality of the data allowed to extend the level scheme of ¹⁶⁰Dy by 24 new levels and 98 new γ-transitions and identify a number of wrong assignments published in the literature.

[1] R.F. Casten and P. von Brentano, Phys. Rev. C 50, R1280 (1994).