title: Isospin Mixing Reveals ^{30}P(p,γ)^{31}S Resonance Influencing Nova Nucleosynthesis.
abstract: The thermonuclear ^{30}P(p,γ)^{31}S reaction rate is critical for modeling the final elemental and isotopic abundances of ONe nova nucleosynthesis, which affect the calibration of proposed nova thermometers and the identification of presolar nova grains, respectively. Unfortunately, the rate of this reaction is essentially unconstrained experimentally, because the strengths of key ^{31}S proton capture resonance states are not known, largely due to uncertainties in their spins and parities. Using the β decay of ^{31}Cl, we have observed the β-delayed γ decay of a ^{31}S state at E_{x}=6390.2(7)  keV, with a ^{30}P(p,γ)^{31}S resonance energy of E_{r}=259.3(8)  keV, in the middle of the ^{30}P(p,γ)^{31}S Gamow window for peak nova temperatures. This state exhibits isospin mixing with the nearby isobaric analog state at E_{x}=6279.0(6)  keV, giving it an unambiguous spin and parity of 3/2^{+} and making it an important l=0 resonance for proton capture on ^{30}P.
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: M B
authors.initials: MB
authors.lastname: Bennett
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: C
authors.initials: C
authors.lastname: Wrede
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Brown
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: S N
authors.initials: SN
authors.lastname: Liddick
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: D
authors.initials: D
authors.lastname: Pérez-Loureiro
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
authors.forename: D W
authors.initials: DW
authors.lastname: Bardayan
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: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.|Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Chipps
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: C
authors.initials: C
authors.lastname: Fry
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: B E
authors.initials: BE
authors.lastname: Glassman
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: C
authors.initials: C
authors.lastname: Langer
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: N R
authors.initials: NR
authors.lastname: Larson
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.
authors.forename: E I
authors.initials: EI
authors.lastname: McNeice
authors.affiliation: Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA.|Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Meisel
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: W
authors.initials: W
authors.lastname: Ong
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
authors.forename: P D
authors.initials: PD
authors.lastname: O'Malley
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: S D
authors.initials: SD
authors.lastname: Pain
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Prokop
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: H
authors.initials: H
authors.lastname: Schatz
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Department of Geology and Physics, University of Southern Indiana, Evansville, Indiana 47712, USA.
authors.forename: S B
authors.initials: SB
authors.lastname: Schwartz
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.|Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: S
authors.initials: S
authors.lastname: Suchyta
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: P
authors.initials: P
authors.lastname: Thompson
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Walters
authors.affiliation: Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.|National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: X
authors.initials: X
authors.lastname: Xu