Improving the P30(p,γ)S31 rate in oxygen-neon novae: Constraints on Jπ values for proton-threshold states in S31

A. Parikh, K. Wimmer, T. Faestermann, R. Hertenberger, J. José, R. Longland, H.-F. Wirth, V. Bildstein, S. Bishop, A. A. Chen, J. A. Clark, C. M. Deibel, C. Herlitzius, R. Krücken, D. Seiler, K. Straub, and C. Wrede
Phys. Rev. C 83, 045806 – Published 27 April 2011

Abstract

Calculation of the thermonuclear P30(p,γ)S31 rate in oxygen-neon nova explosions depends critically upon nuclear structure information for states within ∼600 keV of the 30P+p threshold in S31. We have studied the P31(3He,t)S31 reaction at 25 MeV using a high-resolution quadrupole-dipole-dipole-dipole magnetic spectrograph. Tritons corresponding to the states Ex(S31) ∼ 6.1–7.1 MeV were observed at ten angles between θlab = 10° and 55°. States that were only tentatively identified in past studies have been observed unambiguously. For the first time, we have measured and analyzed angular distributions of the P31(3He,t)S31 reaction. We present, also for the first time, a consistent set of experimental spin constraints for all except one of the critical proton-threshold states in S31. Hydrodynamic nova simulations have been calculated in order to assess the impact on nova nucleosynthesis of remaining uncertainties in Jπ values of S31 states and the unknown relevant proton spectroscopic factors. We find that these uncertainties may lead to a factor of up to 20 variation in the P30(p,γ)S31 rate over typical nova peak temperatures, which may then lead to a factor of up to 4 variation in the nova yields of Si-Ar isotopes.

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  • Received 7 February 2011

DOI:https://doi.org/10.1103/PhysRevC.83.045806

©2011 American Physical Society

Authors & Affiliations

A. Parikh1,2,3,4,*, K. Wimmer3,4,5, T. Faestermann3,4, R. Hertenberger4,6, J. José1,2, R. Longland1, H.-F. Wirth4,6, V. Bildstein3,4, S. Bishop3,4, A. A. Chen7,8, J. A. Clark9, C. M. Deibel9,10, C. Herlitzius3,4, R. Krücken3,4,†, D. Seiler3,4, K. Straub3,4, and C. Wrede11

  • 1Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, E-08036 Barcelona, Spain
  • 2Institut d’Estudis Espacials de Catalunya, E-08034 Barcelona, Spain
  • 3Physik Department E12, Technische Universität München, D-85748 Garching, Germany
  • 4Maier-Leibnitz-Laboratorium der Münchner Universitäten (MLL), D-85748 Garching, Germany
  • 5National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 6Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany
  • 7Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
  • 8Excellence Cluster Universe, Technische Universität München, D-85748 Garching, Germany
  • 9Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 10Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
  • 11Department of Physics, University of Washington, Seattle, Washington 98195, USA

  • *anuj.r.parikh@upc.edu
  • Present address: TRIUMF, Vancouver, BC, V6T 2A3, Canada.

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Vol. 83, Iss. 4 — April 2011

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