The COMPTEL instrument performed the first mapping of the 1.809 MeV photons in the Galaxy, triggering considerable interest in determining the sources of interstellar Al-26. The predicted Al-26 is too low compared to the observation; for a better understanding more accurate rates for the Mg-25(p,gamma)Al-26 reaction are required. The Mg-25(p,gamma)Al-26 reaction has been investigated at the resonances at(11) E-r = 745, 418, 374, and 304 keV at Ruhr-Universitat-Bochum using a Tandem accelerator and a 4 pi NaI detector. In addition, the resonance at E-r = 189 keV has been measured deep underground at Laboratori Nazionali del Gran Sasso, exploiting the strong suppression of a cosmic background. This low resonance has been studied with the 400 kV LUNA accelerator and an HPGe detector. The preliminary results of the resonance strengths will be reported.
Measurement of Mg-25(p,gamma)Al-26 resonance strengths via gamma spectrometry
GERVINO, Gianpiero;
2008-01-01
Abstract
The COMPTEL instrument performed the first mapping of the 1.809 MeV photons in the Galaxy, triggering considerable interest in determining the sources of interstellar Al-26. The predicted Al-26 is too low compared to the observation; for a better understanding more accurate rates for the Mg-25(p,gamma)Al-26 reaction are required. The Mg-25(p,gamma)Al-26 reaction has been investigated at the resonances at(11) E-r = 745, 418, 374, and 304 keV at Ruhr-Universitat-Bochum using a Tandem accelerator and a 4 pi NaI detector. In addition, the resonance at E-r = 189 keV has been measured deep underground at Laboratori Nazionali del Gran Sasso, exploiting the strong suppression of a cosmic background. This low resonance has been studied with the 400 kV LUNA accelerator and an HPGe detector. The preliminary results of the resonance strengths will be reported.
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