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Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Structure and Dynamics of Nuclei 6

HK 26.6: Talk

Tuesday, March 24, 2015, 16:00–16:15, T/SR14

Investigation of two-phonon 1 states in 40Ca and 140Ce with the γ3 setup at HIγS — •Julius Wilhelmy1, Vera Derya1, Janis Endres1, Andreas Hennig1, Bastian Löher2,3, Deniz Savran2,3, Werner Tornow4, and Andreas Zilges11Institute 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 harmonic coupling of a quadrupole and an octupole vibrational excitation results in a quintuplet of Jπ=1 to 5 vibrational states at the sum of the constituent excitation energies. Their detailed γ-decay behavior can provide information about their structure. For 40Ca and 140Ce, possible two-phonon E1 excitations were studied with the high-efficiency γ3 setup [1] at the High Intensity γ-ray Source facility at TUNL in Durham, USA. The γ3 setup consists of an array of HPGe and LaBr3 detectors with high efficiency and enables the measurement of γ-γ coincidences. The determination of the B(E2; 11 → 31) value was possible showing a dominant two-phonon character of the 11 state in 40Ca. For the same decay in 140Ce, an upper limit for the reduced transition probability can be given and an unexpected E1 decay to the 02+ state was observed. The experimental results will be presented and discussed with regard to systematics and theoretical predictions. 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

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