New measurement of the Ec.m.=323 keV resonance in the F19(p,γ)Ne20 reaction

M. Williams, P. Adsley, B. Davids, U. Greife, D. Hutcheon, J. Karpesky, A. Lennarz, M. Lovely, and C. Ruiz
Phys. Rev. C 103, 055805 – Published 12 May 2021

Abstract

At temperatures below 0.1 GK, the F19(p,γ)Ne20 reaction is the only breakout path out of the CNO cycle. Experimental studies of this reaction are challenging from a technical perspective due to copious γ-ray background from the far stronger F19(p,α)O16 reaction channel. Here, we present the first inverse kinematics study of the F19(p,γ)Ne20 reaction, in which we measure the strength of the 323-keV resonance. We find a strength value of ωγ=3.30.9+1.1 meV, which is a factor of two larger than the most recent previous study. The discrepancy is likely the result of a direct to ground state transition which previous studies were not sensitive to. We also observe the transition to the first 2 state, which has not been observed for this resonance in previous studies. A new thermonuclear reaction rate is calculated and compared with the literature.

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  • Received 19 December 2020
  • Accepted 22 March 2021

DOI:https://doi.org/10.1103/PhysRevC.103.055805

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

M. Williams1,2,*, P. Adsley3,4, B. Davids2,5, U. Greife6, D. Hutcheon2, J. Karpesky6, A. Lennarz2, M. Lovely6, and C. Ruiz2

  • 1Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 2TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
  • 3School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa
  • 4iThemba Laboratory for Accelerator Based Sciences, Somerset West 7129, South Africa
  • 5Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia,Canada V5A 1S6
  • 6Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA

  • *mwilliams@triumf.ca

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Issue

Vol. 103, Iss. 5 — May 2021

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