The 'missing' 3+ state of Ne-18 and explosive F-17 (p, gamma) burning

Garcia, A.; Adelberger, E.G.; Magnus, P.V.; Markoff, D.M.; Swartz, K.B.; Smith, M.S.; Hahn, K.I.; Bateman, N.; Parker, P.D.

doi:10.1103/PhysRevC.43.2012

The 'missing' 3+ state of Ne-18 and explosive F-17 (p, gamma) burning

A. Garcia
(
- Washington U., Seattle
)
,
E.G. Adelberger
(
- Washington U., Seattle
)
,
P.V. Magnus
(
- Washington U., Seattle
)
,
D.M. Markoff
(
- Washington U., Seattle
)
,
K.B. Swartz
(
- Washington U., Seattle
)

Apr, 1991

7 pages

Published in:

Phys.Rev.C 43 (1991) 2012-2019

DOI:

10.1103/PhysRevC.43.2012

View in:

Nuclear Science References

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Abstract: (APS)

Wiescher, Görres, and Thielemann suggested that a "missing" Jπ=3+ level in Ne18 should occur at Ex≈4.33 MeV, only ≈410 keV above the F17+p threshold. They noted that this level would provide an s-wave resonance in the F17(p, γ) reaction, greatly increasing its thermonuclear reaction rate. This, in turn, would have a pronounced effect on the production of O17 and O18 in explosive stellar environments. We have searched for this level using the O16(He3, n) reaction. High-resolution time-of-flight spectra show that the 3+ level occurs at Ex=4.561±0.009 MeV, ≈230 keV higher than suggested. The astrophysical consequences of this result are discussed.

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