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

R.L. Kozub, D.W. Bardayan, J.C. Batchelder, J.C. Blackmon, C.R. Brune, A.E. Champagne, J.A. Cizewski, T. Davinson, U. Greife, C.J. Gross, C.C. Jewett, R.J. Livesay, Z. Ma, B.H. Moazen, C.D. Nesaraja, L. Sahin, J.P. Scott, D. Shapira, M.S. Smith, J.S. ThomasP.J. Woods

Research output: Contribution to journalArticlepeer-review

Abstract

The degree to which the (p,γ) and (p,α) reactions destroy F at temperatures (1-4) × 10 K is important for understanding the synthesis of nuclei in nova explosions and for using the long-lived radionuclide F, a target of γ-ray astronomy, as a diagnostic of nova mechanisms. The reactions are dominated by low-lying proton resonances near the F+p threshold (E = 6.411 MeV in Ne). To gain further information about these resonances, we used a radioactive F beam from the Holifield Radioactive Ion Beam Facility to selectively populate corresponding mirror states in F via the inverse H( F,p) F neutron transfer reaction. Neutron spectroscopic factors were measured for states in F in the excitation energy range 0-9 MeV. Widths for corresponding proton resonances in Ne were calculated using a Woods-Saxon potential. The results imply significantly lower F(p,γ) Ne and F(p,α) O reaction rates than reported previously, thereby increasing the prospect of observing the 511 keV annihilation radiation associated with the decay of F in the ashes ejected from novae.
Original languageEnglish
JournalPhysical Review C
Volume71
Issue number3
DOIs
Publication statusPublished - 1 Mar 2005

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