The astrophysical rate of 15O(alpha,gamma)19Ne via the (p,t) reaction in inverse kinematics

Abstract

A recoil coincidence technique has been applied to measure the alpha-decay branching ratios of near-threshold states in 19Ne. Populating these states using the (p,t) reaction in inverse kinematics, we detected the recoils and their decay products with 100% geometric efficiency using a magnetic spectrometer. Combining our branching ratio measurements with independent determinations of the radiative widths of these states, we calculate the astrophysical rate of 15O(alpha,gamma)19Ne. Using this reaction rate, we perform hydrodynamic calculations of nova outbursts and conclude that no significant breakout from the hot CNO cycles into the rp process occurs in novae via 15O(alpha,gamma)19Ne.

submitted to PRC

References in corpus (8)

• The endpoint of the rp process on accreting neutron stars
• Nucleosynthesis in Classical Novae: ONe vs. CO White Dwarfs
• The Effects of Thermonuclear Reaction Rate Variations on Nova Nucleosynthesis: A Sensitivity Study
• Synthesis of intermediate-mass elements in classical novae: from Si to Ca
• Instrumentation for and First Results on Nuclear Responses for Supernova Explosions
• The ${}^{15}$N($\mathbf{\alpha }$,$\mathbf{\gamma }$)${}^{19}$F reaction and nucleosynthesis of ${}^{19}$F
• Comparison of low--energy resonances in 15N(alpha,gamma)19F and 15O(alpha,gamma)19Ne and related uncertainties
• Alpha-decay branching ratios of near-threshold states in 19Ne and the astrophysical rate of 15O(alpha,gamma)19Ne

Cited by in corpus (12)

• Charged-Particle Thermonuclear Reaction Rates: II. Tables and Graphs of Reaction Rates and Probability Density Functions
• X-ray binaries
• The Effects of Variations in Nuclear Processes on Type I X-Ray Burst Nucleosynthesis
• Charged-Particle Thermonuclear Reaction Rates: III. Nuclear Physics Input
• The importance of 15O(a,g)19Ne to X-ray bursts and superbursts
• The ${}^{15}$O($\alpha$,$\gamma$)${}^{19}$Ne Breakout Reaction and Impact on X-Ray Bursts
• The Influence of Uncertainties in the 15O(alpha,gamma)19Ne Reaction Rate on Models of Type I X-Ray Bursts
• Lifetimes of states in 19Ne above the 15 O + alpha breakup threshold
• Lifetime of 19Ne*(4.03 MeV)
• Proton-decaying states in 22Mg and the nucleosynthesis of 22Na in novae
• On the Physics of Type I X-ray Bursts on Accreting Neutron Stars at High Accretion Rates
• Doppler Broadening in ${}^{20}$Mg($\beta p\gamma$)${}^{19}$Ne Decay