Münster 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 4: Structure and Dynamics of Nuclei I
HK 4.4: Vortrag
Montag, 27. März 2017, 17:45–18:00, F 2
Observation of single-particle nature of the low-lying E1 strength in 120Sn — •Michael Weinert, Michelle Färber, Miriam Müscher, Simon G. Pickstone, Mark Spieker, Julius Wilhelmy, Sarah Prill, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne.
A 119Sn(d,pγ) experiment was performed using the combined setup SONIC@HORUS at the 10 MV FN Tandem accelerator in Cologne. The excitation of states in the region of the Pygmy Dipole Resonance (PDR) via this neutron-transfer reaction was investigated in detail. The setup consisted of 14 HPGe and 6 ΔE-E silicon telescope detectors, allowing an offline selection of excitation and deexcitation channels due to the coincident detection of γ-rays and charged particles. Data show a clear excitation of states in the PDR region and several states in this region were identified as J=1 states by comparison to data from a Nuclear Resonance Fluorescence (NRF) experiment. Individual branching ratios could be determined, shedding more light on the internal structure of the PDR. By normalizing the relative excitation in the (d,pγ) reaction to the B(E1) values extracted from NRF, a splitting into two groups of states seems evident, which might hint at a different single-particle character of these groups. This contribution will present the (d,pγ) experiment and all observables determined. Furthermore, results will be put into context by comparison to data from other experiments, i.e., NRF and (p,p’) experiments.
Supported by DFG (ZI 510/7-1). J.W. and S.P. are supported by the Bonn-Cologne Graduate School of Physics and Astronomy.