Lifetime of the astrophysically important 4.03-MeV state in 19Ne

Details Lifetime of the astrophysically important 4.03-MeV state in 19Ne Lifetime of the astrophysically important 4.03-MeV state in 19Ne

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvc..72d1302t&link_type=abstract

Physical Review C, vol. 72, Issue 4, id. 041302

Physics

Nuclear Physics

14

6<=A<=19, Lifetimes, Transfer Reactions, Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments

Scientific paper

The 15O(α,γ)19Ne reaction is one of the most important breakout reactions for the hot CNO cycles. However, the relevant states in 19Ne at excitation energies of 4 5 MeV have not been well studied. The lifetimes of these states are not known and are only constrained by experimental upper and lower limits. In particular, accurate knowledge of the γ- and α-decay widths of the 4.03-MeV state of 19Ne is important, since the resonance strength of this level dominates the reaction rate for the astrophysically relevant temperatures T9<0.6. In this work, we employed an improved Doppler-shifted attenuation method to obtain lifetime values of this and other states via 17O(3He, n-γ)19Ne. For the 4.03-MeV state, the measured excitation energy is 4034.5±0.8 keV and the mean lifetime, measured here for the first time, is 13+9-6 fs at the confidence level of 1σ and 13+16-9 fs at the confidence level of 2σ. This result is in excellent agreement with the 9-fs prediction by Langanke, Wiescher, Fowler, and Görres.

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