Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Nukleare Astrophysik - Poster

HK 34.2: Poster

Mittwoch, 23. März 2011, 14:00–16:00, Foyer Chemie

Counting Setup for Activation Experiments in Nuclear Astrophysics — •Lars Netterdon, Michael Elvers, Janis Endres, Andreas Hennig, Anne Sauerwein, and Andreas Zilges — Institut für Kernphysik, Universität zu Köln

Experimentally determined proton and α-particle reaction rates are of crucial importance to improve the accuracy of p-process network calculations. The activation method has some clear advantages where it is applicable compared to in-beam measurements, e.g., very low background radiation. Therefore, we developed a new counting setup at the Institute for Nuclear Physics in Cologne equipped with a clover-type HPGe detector consisting of four crystals with a relative efficiency of 120% at E_γ= 1332 keV compared to a standard 7,62 cm × 7,62 cm NaI detector. This provides the possibility to measure coincidences between the crystals or use them in an add-back mode which gives access to cross section measurements in the µb range. In this contribution we illustrate the counting setup and present first results.
Supported by the DFG (ZI 510/5-1) and by the Bonn-Cologne Graduate School of Physics and Astronomy.