München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Structure and Dynamics of Nuclei VIII
HK 42.3: Talk
Wednesday, March 20, 2019, 17:15–17:30, HS 14
Investigation of the low-lying dipole response in 120Sn — •M. Müscher1, M. Färber1, D. Savran2, P. Scholz1, R. Schwengner3, M. Spieker4, J. Wilhelmy1, and A. Zilges1 — 1University of Cologne, Institute for Nuclear Physics, Germany — 2GSI, Darmstadt, Germany — 3HZDR, Dresden-Rossendorf, Germany — 4NSCL, Michigan State University, MI 48824, USA
The low-lying dipole strength of the proton-magic nucleus 120Sn was investigated in a real-photon scattering experiment. The measurement was performed at the γELBE facility at the Helmholtz-Zentrum Dresden-Rossendorf [1] where bremsstrahlung was used as photon source with an endpoint energy of 9.5 MeV.
The nucleus 120Sn is a well-suited candidate for a systematic study of the Pygmy Dipole Resonance (PDR) because the tin isotopic chain covers a large range of N/Z ratios. Furthermore, the results of a previous bremsstrahlung experiment on 120Sn neither confirmed the expectation of an increase of the electric dipole strength with an increasing N/Z ratio [2] nor fit to the results of a (p,p’) measurement [3]. To investigate these discrepancies this additional (γ,γ′) experiment was performed. Experimental details and preliminary results will be presented.
Supported by the BMBF (05P15PKEN9) and the Alliance Program of the Helmholtz Association (HA216/EMMI).
[1] R. Schwengner et al., Nucl. Instr. and Meth. A 555 (2005) 211.
[2] B. Özel-Tashenov et al., Phys. Rev. C 90 (2014) 024304.
[3] A.M. Krumbholz et al., Phys. Lett. B 744 (2015) 7.