Thermonuclear reaction rate of Si29(p,γ)P30

L. N. Downen, C. Iliadis, A. E. Champagne, T. B. Clegg, A. Coc, and J. Dermigny
Phys. Rev. C 105, 055804 – Published 13 May 2022

Abstract

The thermonuclear rate of the Si29(p,γ)P30 reaction impacts the Si29 abundance in classical novae. A reliable reaction rate is essential for testing the nova paternity of presolar stardust grains. At present, the fact that no classical nova grains have been unambiguously identified in primitive meteorites among thousands of grains studied is puzzling, considering that classical novae are expected to be prolific producers of dust grains. We investigated the Si29+p reaction at center-of-mass energies of 200420keV, and present improved values for resonance energies, level excitation energies, resonance strengths, and branching ratios. One new resonance was found at a center-of-mass energy of 303keV. For an expected resonance at 215keV, an experimental upper limit could be determined for the strength. We evaluated the level structure near the proton threshold, and present new reaction rates based on all the available experimental information. Our new reaction rates have much reduced uncertainties compared with previous results at temperatures of T140 MK, which are most important for classical nova nucleosynthesis. Future experiments to improve the reaction rates at lower temperatures are discussed.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 23 February 2022
  • Accepted 3 May 2022

DOI:https://doi.org/10.1103/PhysRevC.105.055804

©2022 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

L. N. Downen1,2, C. Iliadis1,2,*, A. E. Champagne1,2, T. B. Clegg1,2, A. Coc3, and J. Dermigny1,2

  • 1Department of Physics & Astronomy, University of North Carolina at Chapel Hill, North Carolina 27599-3255, USA
  • 2Triangle Universities Nuclear Laboratory (TUNL), Duke University, Durham, North Carolina 27708, USA
  • 3CNRS/IN2P3, IJCLab, Université Paris-Saclay, Bâtiment, 104, F-91405 Orsay Campus, France

  • *iliadis@unc.edu

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 105, Iss. 5 — May 2022

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×