Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Structure and Dynamics of Nuclei 1

HK 6.6: Vortrag

Montag, 23. März 2015, 16:00–16:15, T/HS2

New excited states in sd-shell nucleus ³³P — •B. Fu, P. Reiter, K. Arnswald, H. Hess, R. Hirsch, L. Lewandowski, D. Schneiders, M. Seidlitz, B. Siebeck, T. Steinbach, A. Vogt, A. Wendt, and K. Wolf — Institut für Kernphysik, Universität zu Köln

Isospin-symmetry breaking in nuclear physics is mainly described by Mirror-Energy Differences (MED) for mirror nuclei or Triplet-Energy Differences (TED) for isobaric triplets. Modified USD-calculations [1] successfully reproduce MED for T=1, 3/2, 2 sd-shell nuclei. Refined tests of theory are given by lifetime measurements in order to deduce transition-strength values. In order to study the mirror pair ³³Ar and ³³P, the fusion-evaporation reaction ¹³C + ²⁶Mg at 46 MeV was measured at the Cologne tandem accelerator and the HORUS spectrometer employing the Doppler-Shift-Attenuation-Method (DSAM). First results yielded new γ-ray transitions in ³³P and ³³S. The level scheme of ³³P was extended up to excitation energies of 10 MeV. Spins and parities of the new levels were determined exploiting γγ-angular correlations. Together with values from the proton-rich T_z = − 3/2 partner, the levels are compared to shell model calculations, describing excitation energies of sd -shell mirror pairs.

[1] A. Wendt et al.; Phys. Rev. C 90 (2014) 054301