Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 30: Nuclear Physics / Spectroscopy IV
HK 30.4: Vortrag
Mittwoch, 13. März 2002, 15:00–15:15, B
Magnetic and collective rotation in 79Br — •F. Dönau1, R. Schwengner1, T. Servene1, H. Schnare1, J. Reif1, G. Winter1, L. Käubler1, H. Prade1, S. Skoda2, J. Eberth2, H.G. Thomas2, F. Becker2, B. Fiedler2, S. Freund2, S. Kasemann2, T. Steinhardt2, O. Thelen2, T. Härtlein3, C. Ender3, F. Köck3, P. Reiter3, and D. Schwalm3 — 1FZ Rossendorf — 2Universität Köln — 3MPI Heidelberg
Excited states of the nucleus 79Br were investigated via the reaction 76Ge(7Li,4n) at 35 MeV. A magnetic dipole (M1) band starting at Jπ = 15/2− was observed up to Jπ = (29/2−). Mean lifetimes were deduced for most of the levels of the M1 band. We have interpreted the M1 band by applying the hybrid version of the Tilted-Axis-Cranking (TAC) model together with the shell-correction method. The Total Routhian Surfaces calculated within the TAC model predict a substantial triaxial deformation for the excited 3qp configuration π (g9/2) ν (g9/2) ν (fp) assigned to the M1 band. The comparison of experimental characteristics with predictions of the TAC calculations shows that the M1 band can be described by this tilted configuration which implies a strong magnetic component. On the other hand, considerable contributions of the collective spin are necessary to generate high spin. The M1 band is therefore considered as a band including components of both, magnetic and electric rotation.