München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.55: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
Nuclear structure properties of neutron-rich Ge-Kr isotopes in the "weak" r-process — •Stefan Hennrich1,2, Matthew Quinn3, Andreas Wöhr3, Jorge Pereira-Conca4, Ani Aprahamian3, Hendrik Schatz4, Karl-Ludwig Kratz1,2, and Fernando Montes4 — 1Inst. für Kernchemie, Univ. Mainz, Germany — 2HGF-VISTARS, Germany — 3ISNAP, Notre Dame, USA — 4NSCL/MSU, USA
Gross β-decay properties, such as half-lives and delayed-neutron emission probabilities, of neutron-rich nuclei in the Ge-Kr region may contain first information about the phase transition from spherical to deformed shapes. Furthermore, they are important for modelling the "weak" r-process. With this twofold motivation, we have perfomed an experiment at NSCL/MSU, using a primary beam of 136Xe with an energy of 120 MeV/u inpinging on an Be target. We report here on the measurements of T1/2 an Pn values using the BCS β-detector system, the NERO 4π neutron longcounter and a γ detector setup. The preliminary results are compared to QRPA predictions, and are included into r-process abundance calculations. This Projects has been supported by DFG, HGF-VISTARS, NSF (JINA), NSF (NSCL) and NSF (Notre Dame).