Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Nukleare Astrophysik

HK 9.4: Vortrag

Montag, 19. März 2012, 17:30–17:45, RW 2

Measurements of proton-induced reactions on ruthenium-96 in the ESR at GSI — •Ganna Rastrepina — Goethe-Universität, Frankfurt am Main, D-64291, Germany

The Experimental Storage Ring at GSI provides the possibility to investigate radioactive isotopes, which are relevant for the astrophysical nucleosynthesis p-process. Measurements of proton-induced and alpha-induced reactions in inverse kinematics allow to determine the cross-sections for these reactions. The reaction products are identified by their mass-over-charge ratio. A pioneering experiment has been performed at the Experimental Storage Ring (ESR) at GSI using a stable ⁹⁶Ru beam at 9-11 AMeV and a hydrogen target. The different background components accompanying the ⁹⁶Ru(p,γ)⁹⁷Rh reaction were simulated with Geant4 code. Such background reactions are ⁹⁶Ru(p,α)⁹³Tc, ⁹⁶Ru(p,n)⁹⁶Rh and ⁹⁶Ru⁴⁴⁺(p,p)⁹⁶Ru⁴³⁺. In these simulations, the experimental setup was described in detail from the target to the detector position. A comparison of simulated predictions with the experimental results shows a good agreement and allows the extraction of the cross section. The reaction cross-section was calculated relative to the cross section of the electron capture for the ⁹⁶Ru⁴⁴⁺(p,p)⁹⁶Ru⁴³⁺ reaction. This project was supported by the Helmholtz International Center for FAIR and the Helmholtz Young Investigator Group VH-NG-327.