title: Direct measurements of ²²Na(p,γ)²³Mg resonances and consequences for ²²Na production in classical novae.
abstract: The radionuclide 22Na is a potential astronomical observable that is expected to be produced in classical novae in quantities that depend on the thermonuclear rate of the 22Na(p,γ)23Mg reaction. We have measured the strengths of low-energy 22Na(p,γ)23Mg resonances directly and absolutely using a radioactive 22Na target. We find the strengths of resonances at Ep=213, 288, 454, and 610 keV to be higher than previous measurements by factors of 2.4-3.2, and we exclude important contributions to the rate from proposed resonances at Ep=198, 209, and 232 keV. The 22Na abundances expected in the ejecta of classical novae are reduced by a factor of ≈2.
authors.affiliation: Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA. sallaska@u.washington.edu
authors.forename: A L
authors.initials: AL
authors.lastname: Sallaska
authors.forename: C
authors.initials: C
authors.lastname: Wrede
authors.forename: A
authors.initials: A
authors.lastname: García
authors.forename: D W
authors.initials: DW
authors.lastname: Storm
authors.forename: T A D
authors.initials: TA
authors.lastname: Brown
authors.forename: C
authors.initials: C
authors.lastname: Ruiz
authors.forename: K A
authors.initials: KA
authors.lastname: Snover
authors.forename: D F
authors.initials: DF
authors.lastname: Ottewell
authors.forename: L
authors.initials: L
authors.lastname: Buchmann
authors.forename: C
authors.initials: C
authors.lastname: Vockenhuber
authors.forename: D A
authors.initials: DA
authors.lastname: Hutcheon
authors.forename: J A
authors.initials: JA
authors.lastname: Caggiano