B. Davids, A. M. van den Berg, P. Dendooven, F. Fleurot, M. Hernanz, M. Hunyadi, M. A. de Huu, J. Jose, K. E. Rehm, R. E. Segel, R. H. Siemssen, H. W. Wilschut, H. J. Wortche, A. H. Wuosmaa
Published 2003-03-24Version 1
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.
Comments: submitted to PRC
Journal: Phys.Rev. C67 (2003) 065808
Alpha-decay branching ratios of near-threshold states in 19Ne and the astrophysical rate of 15O(alpha,gamma)19Ne
The astrophysical rate of 15O(alpha,gamma)19Ne via recoil-decay tagging and its implications for nova nucleosynthesis
$β^{+}$ Gamow-Teller strengths from unstable $^{14}$O via the $(d,{}^2\text{He})$ reaction in inverse kinematics
