Thermonuclear reaction rate of ${}^{29}$Si(p,$\gamma$)${}^{30}$P

Abstract

The thermonuclear rate of the ${}^{29}$Si(p,$\gamma$)${}^{30}$P reaction impacts the ${}^{29}$Si 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 ${}^{29}$Si $+$ $p$ reaction at center-of-mass energies of $200$ $-$ $420$~keV, 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 $303$ keV. For an expected resonance at $215$~keV, 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 to previous results at temperatures of $T$ $\ge$ $140$~MK, which are most important for classical nova nucleosynthesis. Future experiments to improve the reaction rates at lower temperatures are discussed.

arXiv comment5 figures

References in corpus (11)

• Charged-Particle Thermonuclear Reaction Rates: II. Tables and Graphs of Reaction Rates and Probability Density Functions
• Charged-Particle Thermonuclear Reaction Rates: I. Monte Carlo Method and Statistical Distributions
• Charged-Particle Thermonuclear Reaction Rates: III. Nuclear Physics Input
• Nuclear Thermometers for Classical Novae
• 123-321 Models of Classical Novae
• Charged-Particle Thermonuclear Reaction Rates: IV. Comparison to Previous Work
• On Presolar Stardust Grains from CO Classical Novae
• $\gamma$-ray Spectroscopy using a Binned Likelihood Approach
• Calculation of resonance energies from Q-values
• Correlated Uncertainties in Monte Carlo Reaction Rate Calculations
• Thermonuclear Reaction Rate of ${}^{30}$Si(p,$\gamma$)${}^{31}$P

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