The Felsenkeller shallow-underground laboratory achieves gamma-ray backgrounds low enough, and carbon beam currents high enough, to make a sensitive measurement of carbon-12(alpha,gamma)oxygen-16 appear feasible.
The 25Mg(p,g)Al reaction at low astrophysical energies
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abstract
In the present work we report on a new measurement of resonance strengths in the reaction 25Mg(p,gamma)26Al at E_cm= 92 and 189 keV. This study was performed at the LUNA facility in the Gran Sasso underground laboratory using a 4pi BGO summing crystal. For the first time the 92 keV resonance was directly observed and a resonance strength omega-gamma=(2.9+/-0.6)x10E-10 eV was determined. Additionally, the gamma-ray branchings and strength of the 189 keV resonance were studied with a high resolution HPGe detector yielding an omega-gamma value in agreement with the BGO measurement, but 20% larger compared to previous works.
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Background in $\gamma$-ray detectors and carbon beam tests in the Felsenkeller shallow-underground accelerator laboratory
The Felsenkeller shallow-underground laboratory achieves gamma-ray backgrounds low enough, and carbon beam currents high enough, to make a sensitive measurement of carbon-12(alpha,gamma)oxygen-16 appear feasible.