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, gamma)26Al reaction at low astrophysical energies / F., Strieder; Limata, BENEDICTA NORMANNA; A., Formicola; Imbriani, Gianluca; M., Junker; D., Bemmerer; Best, Andreas; C., Broggini; A., Caciolli; P., Corvisiero; H., Costantini; DI LEVA, Antonino; Z., Elekes; Fülöp, Z. s.; G., Gervino; A., Guglielmetti; C., Gustavino; Gyürky, G. y.; A., Lemut; M., Marta; C., Mazzocchi; R., Menegazzo; P., Prati; Roca, Vincenzo; C., Rolfs; C., Rossi Alvarez; E., Somorjai; O., Straniero; F., Terrasi; H. P., Trautvetter. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 707:(2012), pp. 60-65. [10.1016/j.physletb.2011.12.029]
The 25Mg(p, gamma)26Al reaction at low astrophysical energies
LIMATA, BENEDICTA NORMANNA;IMBRIANI, GIANLUCA;BEST, ANDREAS;DI LEVA, ANTONINO;ROCA, VINCENZO;
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
