Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 55: Structure and Dynamics of Nuclei 11
HK 55.1: Gruppenbericht
Donnerstag, 26. März 2015, 14:30–15:00, T/SR19
Location of the maximum of collectivity in N>40 Fe and Cr isotopes∗ — •V. Werner1,2, C. Louchart-Henning1, C. Santamaria3, A. Obertelli3, P. Doornenbal4, and F. Nowacki5 for the SEASTAR collaboration — 1TU Darmstadt — 2Yale University — 3CEA Saclay — 4RIKEN — 5IPHC, CNRS/IN2P3 and Université Louis Pasteur
The liquid-hydrogen target and TPC system MINOS has been combined with the DALI2 detector device for the first time at RIKEN-RIBF within the SEASTAR project. In the first experiment campaign, excited-state energies in neutron-rich Fe and Cr isotopes, as well as 78Ni have been measured. The RIKEN-RIBF cyclotrons delivered a 345 MeV/u 238U beam with an intensity of about 13 pnA, impinging on a Be target. Fission fragments were separated and identified using the BigRIPS spectrograph, and reaction products were analyzed using the ZeroDegree spectrograph behind the secondary target. First results on 21+ and 41+ energies give an indication for the location of the maximum of collectivity in the Fe and Cr isotopic chains. The new MINOS/DALI2 setup, experiment details, and first results on the Fe and Cr isotopes will be presented.
∗Supported by German BMBF Grant No. 05P12RDFN8 and U.S. DOE Grant No. DE-FG02-91ER-40609.