Stellar 26Al is mainly produced through the 25Mg(p,g) reaction in two possible scenarios. 1.hydrostatic H-burning at proton energies between 100 and 200 keV in massive stars, or 2.explosive H-burning at 300-400keV in novae and supernovae. To distinguish between both possibilties requires a better knowledge of the 25Mg(p,g) reaction rate. This rate relies on extremely weak resonances of the reaction whose measurement poses a very difficult task for the usual prompt gamma-ray on line detection. We applied, instead, an off-line method to get new measurements of the strengths of the resonances. 25MgO targets have been bombarded with ~10*18 protons at the resonance energies by an implanter. The determination of the produced 26Al have been performed by the ams set up at the Munich tandem, and, because of an higher total efficiency, also at the VERA facilty in Vienna. Measurements down to the resonance at 96keV will be shown.
See more of Poster Session II
See more of The 10th International Conference on Accelerator Mass Spectrometry (September 5-10, 2005)