Lifetime of the 6793-keV State in 15O

Details Lifetime of the 6793-keV State in 15O Lifetime of the 6793-keV State in 15O

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrvl..87o2501b&link_type=abstract

Physical Review Letters, vol. 87, Issue 15, id. 152501

Physics

23

Scientific paper

The energy derived from the CN cycle at low stellar temperatures is regulated by the 14N(p,γ)15O reaction. A previous direct measurement of this reaction has been interpreted as showing evidence for a subthreshold resonance which makes a major contribution to the reaction rate at low temperatures. This resonance, at Ec.m. = -504 keV would correspond to the known Ex = 6793-keV state in 15O. We have measured a mean lifetime of 1.60+0.75-0.72 fs (90% C.L.) for this state using the Doppler-shift attenuation method. This lifetime is a factor of 15 longer than that inferred from the (p,γ) data and implies that the contribution of the subthreshold resonance is negligible.

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