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Erlangen 2001 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 13: Postersitzung: Kern- und Teilchen- Astrophysik

HK 13.2: Poster

Dienstag, 20. März 2001, 10:30–12:45, R

Excitation function of the 25Mg(p,γ)26Al at stellar energies studied via AMS — •Andres Arazi1, Thomas Faestermann2, Jorge Fernández Niello1, Klaus Knie2, Gunther Korschinek2, Edgar Richter3, Georg Rugel4, Anton Wallner4, and Christian Wallner21Laboratorio TANDAR, CNEA, Argentina — 2Physik Department, Technische Universität München — 3Forschungszentrum Rossendorf — 4Ludwig Maximilians Universität, München

The stellar production of 26Al is of great interest since the detection of the cosmic 1.8 MeV gamma line. Of astrophysical interest is, therefore, the measurement of the excitation function for the 25Mg(p, γ)26Al reaction at energies from 50 to 500 keV. These energies are much below the Coulomb barrier and hence the cross sections involved are extremely small. Due to its high sensitivity accelerator mass spectrometry (AMS) is an appropriate technique to determine the concentration of 26Al formed in this reaction: The 26Al nuclei are produced through the bombardment of thin targets of 25Mg with proton beams simulating the stellar process. These targets are then chemically treated to be used as cathodes in the ion source. The produced 26Al nuclei can be identified and counted with the AMS technique.

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