Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

α -decay branching ratios of near-threshold states in 19 Ne and the astrophysical rate of 15 O ( α , γ ) 19 Ne

α -decay branching ratios of near-threshold states in 19 Ne and the astrophysical rate of 15 O (... The 15 O ( α , γ ) 19 Ne reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends critically on the decay properties of excited states in 19 Ne lying just above the 15 O + α threshold. We have measured the α -decay branching ratios for these states using the p ( 21 Ne , t ) 19 Ne reaction at 43 MeV/nucleon. Combining our measurements with previous determinations of the radiative widths of these states, we conclude that no significant breakout from the hot CNO cycle into the rp process in novas is possible via 15 O ( α , γ ) 19 Ne , assuming that current models accurately represent their temperature and density conditions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

α -decay branching ratios of near-threshold states in 19 Ne and the astrophysical rate of 15 O ( α , γ ) 19 Ne

4 pages

Loading next page...
 
/lp/american-physical-society-aps/decay-branching-ratios-of-near-threshold-states-in-19-ne-and-the-JBrx8M47u7

References (27)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2003 The American Physical Society
ISSN
1089-490X
DOI
10.1103/PhysRevC.67.012801
Publisher site
See Article on Publisher Site

Abstract

The 15 O ( α , γ ) 19 Ne reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends critically on the decay properties of excited states in 19 Ne lying just above the 15 O + α threshold. We have measured the α -decay branching ratios for these states using the p ( 21 Ne , t ) 19 Ne reaction at 43 MeV/nucleon. Combining our measurements with previous determinations of the radiative widths of these states, we conclude that no significant breakout from the hot CNO cycle into the rp process in novas is possible via 15 O ( α , γ ) 19 Ne , assuming that current models accurately represent their temperature and density conditions.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jan 1, 2003

There are no references for this article.