Measurement of the O-17 (p, alpha) N-14 Cross Section at Stellar Energies

Blackmon, J.C.; Champagne, A.E.; Hofstee, M.A.; Smith, M.S.; Downing, R.G.; Lamaze, G.P.

doi:10.1103/PhysRevLett.74.2642

Measurement of the O-17 (p, alpha) N-14 Cross Section at Stellar Energies

J.C. Blackmon
(
- North Carolina U. and
- TUNL, Durham
)
,
A.E. Champagne
(
- North Carolina U. and
- TUNL, Durham
)
,
M.A. Hofstee
(
- North Carolina U. and
- TUNL, Durham
)
,
M.S. Smith
(
- Oak Ridge
)
,
R.G. Downing
(
- NIST, Wash., D.C.
)

Apr 3, 1995

3 pages

Published in:

Phys.Rev.Lett. 74 (1995) 2642-2645

DOI:

10.1103/PhysRevLett.74.2642

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Abstract: (APS)

The cross section for the astrophysically important O17(p,α)N14 reaction was measured at proton energies of 75 and 65 keV. Thick, high-purity Ta2O5 targets (77% enriched O17) and large-area detectors were used with beam currents of 0.45 mA. Backgrounds were measured using Ta2O5 targets of natural isotopic composition. The expected resonance at Ep=70 keV was observed in the data taken at 75 keV, and its proton width was found to be 22±3stat±2target−1beam+2 neV.