Frankfurt 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 46: Poster
HK 46.16: Poster
Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster
Two-phonon E1 excitations in 40Ca and 140Ce — •Martin Baldenhofer1, Vera Derya1, Janis Endres1, Andreas Hennig1, Bastian Löher2,3, Deniz Savran2,3, Werner Tornow4, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne — 2ExtreMe Matter Institute EMMI and Research Division, GSI, Darmstadt — 3Frankfurt Institute for Advanced Studies FIAS, Frankfurt — 4Department of Physics, Duke University, USA
The coupling of a quadrupole- and an octupole-vibrational excitation results in a quintuplet of Jπ=1− to 5− vibrational states with two-phonon structure. Candidates for harmonic two-phonon excitations are found energetically in the vicinity of the sum of the constituent excitation energies. Their structure can be tested by studying their γ-decay behavior in detail. We studied candidates for two-phonon E1 excitations in two nuclei of different mass, namely 40Ca and 140Ce, with the high-efficiency γ3 setup [1] at the High Intensity γ-ray Source facility at the Triangle Universities Nuclear Laboratory in Durham, USA. The mono-energetic γ-ray beam allows for a selective excitation of the states of interest. In combination with the γ3 setup, on the one hand, a high efficiency for γ-ray detection is achieved by an array of HPGe and LaBr detectors, and, on the other hand, the analysis of γ-γ coincidences is possible.
Supported by the DFG (ZI 510/4-2) and the Alliance Program of the Helmholtz Association (HA216/EMMI).
[1] B. Löher et al., Nucl. Instr. and Meth. A 723 (2013) 136