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Phys. Rev. C 71, 032801 (2005) [5 pages]

New constraints on the 18F(p,α)15O rate in novae from the (d,p) reaction

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R. L. Kozub1, D. W. Bardayan2, J. C. Batchelder3, J. C. Blackmon2, C. R. Brune4, A. E. Champagne5, J. A. Cizewski6, T. Davinson7, U. Greife8, C. J. Gross2, C. C. Jewett8, R. J. Livesay8, Z. Ma9, B. H. Moazen1, C. D. Nesaraja1, L. Sahin5,10, J. P. Scott1,2, D. Shapira2, M. S. Smith2, J. S. Thomas6, and P. J. Woods7
1Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
2Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3Oak Ridge Associated Universities, Bldg 6008, P.O. Box 2008, Oak Ridge, Tennessee 37831-6374, USA
4Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
5Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA
6Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019, USA
7Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
8Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
9Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
10Department of Physics, Dumlupinar University, Kutahya, Turkey 43100

Rapid Communication Received 24 May 2004; published 7 March 2005

The degree to which the (p,γ) and (p,α) reactions destroy 18F at temperatures (1-4)×108  K is important for understanding the synthesis of nuclei in nova explosions and for using the long-lived radionuclide 18F, a target of γ-ray astronomy, as a diagnostic of nova mechanisms. The reactions are dominated by low-lying proton resonances near the 18F+p threshold (Ex=6.411  MeV in 19Ne). To gain further information about these resonances, we used a radioactive 18F beam from the Holifield Radioactive Ion Beam Facility to selectively populate corresponding mirror states in 19F via the inverse 2H(18F,p)19F neutron transfer reaction. Neutron spectroscopic factors were measured for states in 19F in the excitation energy range 0–9  MeV. Widths for corresponding proton resonances in 19Ne were calculated using a Woods-Saxon potential. The results imply significantly lower 18F(p,γ)19Ne and 18F(p,α)15O reaction rates than reported previously, thereby increasing the prospect of observing the 511  keV annihilation radiation associated with the decay of 18F in the ashes ejected from novae.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.71.032801
DOI: 10.1103/PhysRevC.71.032801
PACS: 26.30.+k, 21.10.Jx, 25.60.Je, 27.20.+n

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