Publications [#324747] of Arthur E. Champagne

Papers Published
  1. Bertone, PF; Champagne, AE; Powell, DC; Iliadis, C; Hale, SE; Hansper, VY, Lifetime of the 6793-keV state in 15O., Physical Review Letters, vol. 87 no. 15 (October, 2001), pp. 152501 [doi] .

    The energy derived from the CN cycle at low stellar temperatures is regulated by the 14N(p,gamma)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 E(c.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,gamma) data and implies that the contribution of the subthreshold resonance is negligible.