In the present work we report on a new measurement of resonance strengths ωγ in the reaction 25Mg(p, γ)26Al at Ecm=92 and 189 keV. This study was performed at the LUNA facility in the Gran Sasso underground laboratory using a 4π BGO summing crystal. For the first time the 92 keV resonance was directly observed and a resonance strength ωγ=(2.9±0.6)×10−10 eV was determined. Additionally, the γ-ray branchings and strength of the 189 keV resonance were studied with a high resolution HPGe detector yielding an ωγ value in agreement with the BGO measurement, but 20% larger compared to previous works.

The 25Mg(p, γ )26Al reaction at low astrophysical energies / 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. Fülöp, G. Gervino, A. Guglielmetti, C. Gustavino, Gy. Gyürky, A. Lemut, M. Marta, C. Mazzocchi, R. Menegazzo, P. Prati, V. Roca, C. Rolfs, C. Rossi Alvarez, E. Somorjai, O. Straniero, F. Terrasi, H.P. Trautvetter. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 707:1(2012), pp. 60-65.

The 25Mg(p, γ )26Al reaction at low astrophysical energies

A. Guglielmetti;C. Mazzocchi;
2012

Abstract

In the present work we report on a new measurement of resonance strengths ωγ in the reaction 25Mg(p, γ)26Al at Ecm=92 and 189 keV. This study was performed at the LUNA facility in the Gran Sasso underground laboratory using a 4π BGO summing crystal. For the first time the 92 keV resonance was directly observed and a resonance strength ωγ=(2.9±0.6)×10−10 eV was determined. Additionally, the γ-ray branchings and strength of the 189 keV resonance were studied with a high resolution HPGe detector yielding an ωγ value in agreement with the BGO measurement, but 20% larger compared to previous works.
Nuclear astrophysics; Mg-Al cycle; Proton-capture reaction; Reaction rate
Settore FIS/04 - Fisica Nucleare e Subnucleare
Settore FIS/05 - Astronomia e Astrofisica
2012
16-dic-2011
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/178009
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