Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 11: Struktur und Dynamik von Kernen
HK 11.4: Vortrag
Montag, 17. März 2014, 17:30–17:45, HZ 5
Low-lying dipole strength in the N=28 shell-closure nucleus 52Cr* — •Haridas Pai1, Jacob Beller1, Nadia Benouaret1, Joachim Enders1, Timo Hartmann1, Oliver Karg1, Peter von Neumann-Cosel1, Norbert Pietralla1, Vladimir Yu. Ponomarev1, Christopher Romig1, Marcus Scheck1,2,3, Linda Schnorrenberger1, Stephan Volz1, and Markus Zweidinger1 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2School of Engineering, University of the West of Scotland, Paisley, UK — 3SUPA, Scottish Universities Physics Alliance, Glasgow, UK
Low-lying electric and magnetic dipole strengths (E1 and M1, respectively) of atomic nuclei have drawn considerable attention in the last decade. The low-lying dipole strength of the N=28 closed-shell nucleus 52Cr was studied with nuclear resonance fluorescence up to 9.9 MeV, using bremsstrahlung at the superconducting Darmstadt electron linear accelerator S-DALINAC. Twenty-eight spin-1 states were observed between 5.0 and 9.5 MeV excitation energy, 14 of those for the first time and uncertainties for cross sections were reduced in many cases. Both, electric dipole excitations (E1, around 8 MeV) and magnetic dipole excitations (M1, around 9 MeV) were detected. Microscopic calculations within the quasiparticle-phonon nuclear model were performed using a basis which includes one-, two-, and three-phonon configurations to interpret the dipole strength distributions of 52Cr and show good agreement with experimental results.
*Supported by the DFG under contract No. SFB 634 and by the Helmholtz International Center for FAIR.