The 25Mg(p,g)Al reaction at low astrophysical energies
LUNA Collaboration: F. Strieder, B. Limata, A. Formicola, G. Imbriani,, M. Junker, D. Bemmerer, A. Best, C. Broggini, A. Caciolli, P. Corvisiero, H., Costantini, A. DiLeva, Z. Elekes, Zs. F\"ul\"op, G. Gervino, A. Guglielmetti,, C. Gustavino, Gy. Gy\"urky, A. Lemut, M. Marta
TL;DR
This study reports new measurements of resonance strengths in the 25Mg(p,gamma)26Al reaction at low energies, including the first direct observation of the 92 keV resonance, improving understanding of astrophysical processes.
Contribution
First direct measurement of the 92 keV resonance in 25Mg(p,gamma)26Al and refined data on the 189 keV resonance using underground laboratory techniques.
Findings
First direct observation of the 92 keV resonance.
Resonance strength omega-gamma for 92 keV measured as (2.9±0.6)×10^-10 eV.
189 keV resonance strength consistent with previous measurements but 20% higher.
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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