Direct measurement of the low-energy resonances in Ne 22 (α,γ) Mg 26 reaction

Shahina, J. Görres, D. Robertson, M. Couder, O. Gomez, A. Gula, M. Hanhardt, T. Kadlecek, R. Kelmar, P. Scholz, A. Simon, E. Stech, F. Strieder, M. Wiescher

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4 Scopus citations

Abstract

The Ne22(α,γ)Mg26 is an important reaction in stellar helium burning environments as it competes directly with one of the main neutron sources for the s-process, the Ne22(α,n)Mg25 reaction. The reaction rate of the Ne22(α,γ)Mg26 is dominated by the low-energy resonances at Eαlab=650 and 830 keV, respectively. The Eαlab=830-keV resonance has been measured previously, but there are some uncertainties in the previous measurements. We confirmed the measurement of the Eαlab=830-keV resonance using implanted Ne22 targets. We obtained a resonance strength of ωγ=35±4 μeV and provide a weighted average of the present and previous measurements of ωγ=35±2 μeV with reduced uncertainties compared to previous studies. We also attempted to measure the strength of the predicted resonance at Eαlab=650 keV directly for the first time and found an upper limit of ωγ<0.15 μeV for the strength of this resonance. In addition, we also studied the EPlab=851-keV resonance in Ne22(p,γ)Na23 and obtained a resonance strength of ωγ=9.2±0.7 eV with significantly lower uncertainties compared to previous measurements.

Original languageEnglish
Article number025805
JournalPhysical Review C
Volume106
Issue number2
DOIs
StatePublished - 1 Aug 2022
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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