Phys. Rev. Lett. 87, 152501 (2001) [4 pages]Lifetime of the 6793-keV State in 15OReceived 5 February 2001; published 21 September 2001 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. = -504keV would correspond to the known Ex = 6793-keV state in 15O. We have measured a mean lifetime of 1.60-0.72+0.75fs (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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.152501
DOI:
10.1103/PhysRevLett.87.152501
PACS:
21.10.Tg, 26.20.+f, 27.20.+n, 97.10.Tk
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.