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We report on a new lifetime measurement of the E_x=6792 keV state in 15O viathe Doppler-shift attenuation method at the E=259 keV resonance in the reaction14N(p,g)15O. This subthreshold state is of particular importance for thedetermination of the ground state astrophysical S factor of 14N(p,g)15O atstellar energies. The measurement technique has been significantly improvedcompared with previous work. The conclusion of a finite lifetime drawn therecannot be confirmed with the present data. In addition, the lifetime of the twostates at E_x=5181 and 6172 keV have been measured with the same technique inorder to verify the experimental method. We observe an attenuation factorF(tau)>0.98 for the E_x =6172 and 6792 keV states, respectively, correspondingto tau<0.77 fs. The attenuation factor for the E_x=5181 keV state results inF(tau)=0.78+/-0.02 corresponding to tau=8.4+/-1.0 fs in excellent agreementwith literature.

Lifetime measurement of the 6792 keV state in 15O, important for the astrophysical S factor extrapolation in 14N(p,g)15O