Evidence for the existence of the astrophysically important 6.40-MeV state of 31S

Phys. Rev. C 88, 055803 – Published 27 November 2013
D. Irvine, A. A. Chen, A. Parikh, K. Setoodehnia, T. Faestermann, R. Hertenberger, H.-F. Wirth, V. Bildstein, S. Bishop, J. A. Clark, C. M. Deibel, J. Hendriks, C. Herlitzius, R. Krücken, W. N. Lennard, O. Lepyoshkina, R. Longland, G. Rugel, D. Seiler, K. Straub, and C. Wrede

Abstract

Proton-unbound excited states of 31S have been populated with the 32S(d,t)31S reaction at a beam energy of 24 MeV. Tritons corresponding to 31S states with Ex(31S)6.37.1 MeV were momentum analyzed with a high resolution quadrupole-dipole-dipole-dipole (Q3D) magnetic spectrograph at six angles ranging from θlab=15 to 58.5. We report a statistically significant detection of an astrophysically important state at Ex(31S)=6402 (2) keV, whose existence as a third state in this region has been under debate. Using updated A=31 nuclear structure information, we present a new set of proposed 31S-31P mirror assignments for 31S, in which this state is tentatively assigned a spin of 7/2. This level, corresponding to a 30P + p resonance at 271 keV, is likely to have a significant influence on the 30P(p,γ)31S reaction rate in explosive hydrogen burning in classical novae.

DOI: http://dx.doi.org/10.1103/PhysRevC.88.055803

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  • Received 25 July 2013
  • Published 27 November 2013

©2013 American Physical Society

Authors & Affiliations

D. Irvine1,*, A. A. Chen1, A. Parikh2,3, K. Setoodehnia1, T. Faestermann3, R. Hertenberger4, H.-F. Wirth4, V. Bildstein5, S. Bishop3, J. A. Clark6, C. M. Deibel6,7,8, J. Hendriks9, C. Herlitzius3, R. Krücken3,10, W. N. Lennard9, O. Lepyoshkina3, R. Longland2, G. Rugel3, D. Seiler3, K. Straub3, and C. Wrede11,12

  • 1Department of Physics & Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
  • 2Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, E-08036 Barcelona, Spain
  • 3Physik Department E12, Technische Universität München, D-85748 Garching, Germany
  • 4Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85784 Garching, Germany
  • 5Department of Physics, University of Guelph, Guelph, Ontario N1G 2M7, Canada
  • 6Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 7Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
  • 8Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA
  • 9Department of Physics & Astronomy, Western University, London, Ontario N6A 3K7, Canada
  • 10Science Division, TRIUMF National Laboratory, Vancouver, British Columbia V6T 2A3, Canada
  • 11Department of Physics, University of Washington, Seattle, Washington 98195, USA
  • 12Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA

  • *irvinedt@mcmaster.ca

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