Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 16: Spectroscopy: 17 ≤ A ≤ 70

HK 16.8: Vortrag

Montag, 16. März 1998, 18:45–19:00, D

γ-spectroscopy of the nucleus ⁶⁷Zn^* — •O. Thelen, J. Eberth, F. Becker, S. Skoda, H.G. Thomas, B. Fiedler, S. Freund, T. Steinhardt, D. Weißhaar, A. Fitzler, H. Tiesler, and I. Wiedenhöver — Institut für Kernphysik, Univ. zu Köln, Zülpicherstr. 77, D-50937 Köln

Recently, we identified 8 multiplets in ₃₂⁶⁹Ge₃₇, resulting from the coupling of the odd neutron with the core ₃₂⁶⁸Ge₃₆ [1]. The aim of this work was to extend complete spectroscopy to the isotone ₃₀⁶⁷Zn₃₇ in order to study deviations of the weaking coupling model on the basis of the multiplet structure as function of the proton number. Two experiments using the reaction ⁶⁴Ni(α,nγ)⁶⁷Zn at the E_α=14−18 MeV were performed at the Cologne FN Tandem Accelerator.The OSIRIS- Cube-spectrometer provided the coincidence data to extend the level scheme. The linear polarization was measured with a EUROBALL-Cluster-detector, while the angular distributions were determined simultaneously with two encapsulated HPGe-detectors. In combination with an excitation function, spin and parity could be established for a multitude of levels. The comparison of ⁶⁷Zn with ⁶⁹Ge shows the independence of their respective level structure from the proton configuration. This is the first hint, that in ⁶⁷Zn as well as in ⁶⁹Ge, the multiplet structure is still influenced by proton excitations of the core.
^* supported by DFG under contract No. Eb136/2-1
[1] F.Becker et al., Nucl. Phys. A (1997), in press