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The degree to which the (p,gamma) and (p,alpha) reactions destroy 18F attemperatures 1-4x10^8 K is important for understanding the synthesis of nucleiin nova explosions and for using the long-lived radionuclide 18F, a target ofgamma-ray astronomy, as a diagnostic of nova mechanisms. The reactions aredominated by low-lying proton resonances near the 18F+p threshold (E_x=6.411MeV in 19Ne). To gain further information about these resonances, we have useda radioactive 18F beam from the Holifield Radioactive Ion Beam Facility toselectively populate corresponding mirror states in 19F via the inversed(18F,p)19F neutron transfer reaction. Neutron spectroscopic factors weremeasured for states in 19F in the excitation energy range 0-9 MeV. Widths forcorresponding proton resonances in 19Ne were calculated using a Woods-Saxonpotential. The results imply significantly lower 18F(p,gamma)19Ne and18F(p,alpha)15O reaction rates than reported previously, thereby increasing theprospect of observing the 511-keV annihilation radiation associated with thedecay of 18F in the ashes ejected from novae.Comment: Error involving sum rule was corrected. Proton widths were  recalculated using a Woods-Saxon potential. Both low-lying resonances (8- and  38-keV) are now included in the rate band. 12 pages, 4 figures, 1 table.  Submitted to Phys. Rev.

physical review. c. nuclear physics/physical review. c, nuclear physics

New constraints on the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">F</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>18</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo stretchy="false">(</mml:mo><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>α</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>15</mml:mn></mml:mrow…

New constraints on theF18(p,α)O15