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HK: Physik der Hadronen und Kerne

HK 16: Kernphysik/Spektroskopie II

HK 16.1: Gruppenbericht

Dienstag, 18. März 2003, 15:30–16:00, A

An unified approach to nuclear shape phase transitions. — •Jan Jolie¹, Pavel Cejnar², Stefan Heinze¹, Andreas Linnemann¹, and Volker Werner¹ — ¹IKP, Universität zu Köln, Zülpicherstr. 77, 50937 Köln — ²Institute for Nuclear and Particle Physics, Charles University, V. Holesovickach, 180 000 Prague, Csech Republik

The groundstate shap is determining most of the low-energy excitations of atomic nuclei. Using the interacting boson approximation, the possible shapes and, especially, the phase transitions in between were studied. It was found that three different phase exist and that inbetween each pair of phases first order phase transitions occur, whaile at the point where the three phases meet there is an isolated second order phase transition [1]. Then this phase diagram could be directly related to the Landau theory of second order phase transitions [2,3] yielding a new unified view on the structure of nuclei. We will also discuss similarities with the structure of nematic liquid crystals [4] and present experimental evidence for the first order prolate-oblate phase transition.

[1] J.Jolie, R.F. Casten, P. von Brentano, V. Werner, Phys. Rev. Lett. 87 (2001) 162501; [2] J.Jolie, P. Cejnar, R.F. Casten, S. Heinze, A. Linnemann, V. Werner, Phys. Rev.Lett. 89 (2002) 182502; [3] P. cejnar, S. Heinze, J. Jolie, subm. for publ.; [4] E.F. Gramsbergen, L. Longa, W.H. de Heu, Phys. Rep. 135 (1986) 195; [5] J. Jolie, A. Linnemann, subm. for publ.