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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Structure and Dynamics of Nuclei V

HK 20.4: Talk

Tuesday, March 15, 2016, 15:00–15:15, S1/01 A03

Low-lying dipole strengths of ^50,54Cr* — •H Pai¹, P C Ries¹, T Beck¹, J Beller¹, R Beyer², M Bhike^3,4, V Derya⁵, U Gayer¹, J Isaak^6,7, Fnu Krishichayan^3,4, B Löher⁶, V O Nesterenko⁸, N Pietralla¹, G Martinez-Pinedo¹, L Mertes¹, V Yu Ponomarev¹, C Romig¹, D Savran^6,7, R Schwengner², W Tornow^3,4, V Werner¹, J Wilhelmy⁵, A Zilges⁵, and M Zweidinger¹ — ¹Technische Universität Darmstadt, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Germany — ³Duke University, Durham, USA — ⁴TUNL, Durham, USA — ⁵IKP, Universität zu Köln, Germany — ⁶EMMI and GSI, Darmstadt, Germany — ⁷FIAS, Frankfurt am Main, Germany — ⁸JINR, Dubna, Russia

Low-lying electric and magnetic dipole strengths (E1 and M1, respectively), particularly the Pygmy Dipole Resonance (PDR), low-energy orbital M1 mode, and Spin-flip M1 excitations, of atomic nuclei have drawn considerable attention in the last decade. The low-lying dipole strengths of ⁵⁴Cr and ⁵⁰Cr were studied with the method of nuclear resonance fluorescence up to 9.7 MeV, using bremsstrahlung provided by the superconducting Darmstadt electron linear accelerator S-DALINAC. 33 and 52 spin-1 states were observed in ⁵⁰Cr and ⁵⁴Cr, respectively. Parity quantum numbers were determined with a polarized photon scattering at the HIγS, TUNL in Durham, USA. Microscopic calculations within the QPM, QRPA, and Shell Model were performed to interpret the dipole strengths distributions of ^50,54Cr.

*Supported by the DFG under contract No. SFB 634 and ZI 510/7-1 and by HIC for FAIR.