Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Nukleare Astrophysik II

HK 46.3: Vortrag

Donnerstag, 18. März 2010, 15:00–15:15, HG VI

Coulomb dissociation reactions on Mo isotopes for astrophysics applications — •Olga Ershova — Institut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt am Main, Frankfurt a. M., Germany

Photo-dissociation reactions are important for explaining abundances of the nuclei produced via the so-called p-process, which takes place in Type II supernova explosions. Theoretical calculations of the isotopic p-nuclei abundances require a huge reaction network linking thousands of isotopes, where most of the reaction rates have to be derived from theory. However, it is important that as many rates as possible are measured experimentally to provide pivot points for the calculations. In all present models, a significant underproduction of Mo and Ru p-nuclides is observed. At the same time, 92Mo has one of the highest cosmic abundances of all p-nuclei.

At the SIS/FRS/LAND facility at GSI Coulomb excitation experiments on the stable 92,94,100Mo and the unstable 93Mo isotopes were performed in inverse kinematics in order to extract (γ,n) reaction cross sections. The setup provides a possibility to identify the outgoing nucleus with respect to A and Z. Together with a neutron hit in the LAND detector, it allows to tag the proper reaction channel. An important aspect of this project is to verify the method by comparing the data with direct (γ,n) experiments performed with real photons at S-DALINAC (TU Darmstadt) and ELBE (FZD).

This project is supported by the HGF Young Investigators Project VH-NG-327.

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