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

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arxiv nucl-ex/0303010 v1 pith:QPUAJBM5 submitted 2003-03-24 nucl-ex astro-phnucl-th

B. Davids , A. M. van den Berg , P. Dendooven , F. Fleurot , M. Hernanz , M. Hunyadi , M. A. de Huu , J. Jose
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K. E. Rehm R. E. Segel R. H. Siemssen H. W. Wilschut H. J. Wortche A. H. Wuosmaa
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keywords alphagammaratereactionstatesastrophysicalbranchinginverse
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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.

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