München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 21: Postersitzung

HK 21.54: Poster

Dienstag, 21. März 2006, 15:30–17:00, P

Experiments to investigate halflives and P_n-values of weak r-process nuclei at NSCL/MSU ^* — •L. Kern — Institut für Kernphysik, TU Darmstadt, 64289*Darmstadt, Germany

The astrophysical r-process is responsible for the synthesis of roughly half of the elements heavier than iron. Studying the involved nuclei presents a challenge, as they lie far from the valley of stability.
In the context of r-process studies at NSCL/MSU two experiments on neutron-rich isotopes in the Ge-Br and Sr-Mo region have been performed. Isotopes were produced by fragmentation of a 120 MeV/u ¹³⁶Xe beam on a Be target at the A1900 fragment seperator. Nuclei of interest were implanted into a 40x40 double sided strip detector, which is part of a β-counting-system surrounded by neutron detector NERO. NERO consists of 60 proportional counters embedded in a plastic block moderator - leading to a high detection efficiency.
During the experiments halflives and P_n-values have been measured as input for future r-process network calculations.
^* This project has been supported by NSF PHY 01-10253 (NSCL), NSF PHY 02-16783(JINA), NSF (Notre Dame) HGF-VISTARS and *DFG.