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HK: Physik der Hadronen und Kerne

HK 13: Postersitzung: Kern- und Teilchen- Astrophysik

HK 13.2: Poster

Tuesday, March 20, 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 Wallner² — ¹Laboratorio 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.