Direct measurement of the low-energy resonances in Ne22(α,γ)Mg26 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, and M. Wiescher
Phys. Rev. C 106, 025805 – Published 22 August 2022

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.

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  • Received 10 May 2022
  • Revised 8 July 2022
  • Accepted 12 August 2022

DOI:https://doi.org/10.1103/PhysRevC.106.025805

©2022 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Shahina1,2, J. Görres1,2, D. Robertson1,2, M. Couder1,2, O. Gomez1,2, A. Gula1,2, M. Hanhardt3,4, T. Kadlecek3, R. Kelmar1,2, P. Scholz1,2, A. Simon1,2, E. Stech1,2, F. Strieder3, and M. Wiescher1,2

  • 1Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 2The Joint Institution of Nuclear Astrophysics-Center for the Evolution of the Elements, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 3Department of Physics, South Dakota School of Mines and Technology, Rapid City, South Dakota 57701, USA
  • 4South Dakota Science and Technology Authority, Sanford Underground Research Facility, Lead, South Dakota 57754, USA

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Issue

Vol. 106, Iss. 2 — August 2022

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