title: Direct Measurement of the Astrophysical ^{38}K(p,γ)^{39}Ca Reaction and Its Influence on the Production of Nuclides toward the End Point of Nova Nucleosynthesis.
abstract: We have performed the first direct measurement of the ^{38}K(p,γ)^{39}Ca reaction using a beam of radioactive ^{38}K. A proposed ℓ=0 resonance in the ^{38}K+p system has been identified at 679(2) keV with an associated strength of 120_{-30}^{+50}  meV. Upper limits of 1.16 (3.5) and 8.6 (26) meV at the 68% (95%) confidence level were also established for two further expected ℓ=0 resonances at 386 and 515 keV, respectively. The present results have reduced uncertainties in the ^{38}K(p,γ)^{39}Ca reaction rate at temperatures of 0.4 GK by more than 2 orders of magnitude and indicate that Ar and Ca may be ejected in observable quantities by oxygen-neon novae. However, based on the newly evaluated rate, the ^{38}K(p,γ)^{39}Ca path is unlikely to be responsible for the production of Ar and Ca in significantly enhanced quantities relative to solar abundances.
authors.affiliation: Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.|National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom.
authors.forename: G
authors.initials: G
authors.lastname: Lotay
authors.affiliation: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Christian
authors.affiliation: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: C
authors.initials: C
authors.lastname: Ruiz
authors.affiliation: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.|Department of Physics, The University of York, York YO10 5DD, United Kingdom.
authors.forename: C
authors.initials: C
authors.lastname: Akers
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.
authors.forename: D S
authors.initials: DS
authors.lastname: Burke
authors.affiliation: Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
authors.forename: W N
authors.initials: WN
authors.lastname: Catford
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.
authors.forename: A A
authors.initials: AA
authors.lastname: Chen
authors.affiliation: Colorado School of Mines, Golden, Colorado 80401, USA.
authors.forename: D
authors.initials: D
authors.lastname: Connolly
authors.affiliation: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: B
authors.initials: B
authors.lastname: Davids
authors.affiliation: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: J
authors.initials: J
authors.lastname: Fallis
authors.affiliation: Colorado School of Mines, Golden, Colorado 80401, USA.
authors.forename: U
authors.initials: U
authors.lastname: Hager
authors.affiliation: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: D A
authors.initials: DA
authors.lastname: Hutcheon
authors.affiliation: Colorado School of Mines, Golden, Colorado 80401, USA.
authors.forename: A
authors.initials: A
authors.lastname: Mahl
authors.affiliation: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: A
authors.initials: A
authors.lastname: Rojas
authors.affiliation: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.|McGill University, Montreal, Quebec H3A 0G4, Canada.
authors.forename: X
authors.initials: X
authors.lastname: Sun