Direct Measurement of the Key Ec.m.=456keV Resonance in the Astrophysical Ne19(p,γ)Na20 Reaction and Its Relevance for Explosive Binary Systems

R. Wilkinson, G. Lotay, A. Lennarz, C. Ruiz, G. Christian, C. Akers, W. N. Catford, A. A. Chen, D. Connolly, B. Davids, D. A. Hutcheon, D. Jedrejcic, A. M. Laird, L. Martin, E. McNeice, J. Riley, and M. Williams
Phys. Rev. Lett. 119, 242701 – Published 11 December 2017
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Abstract

We have performed a direct measurement of the Ne19(p,γ)Na20 reaction in inverse kinematics using a beam of radioactive Ne19. The key astrophysical resonance in the Ne19+p system has been definitely measured for the first time at Ec.m.=4562+5keV with an associated strength of 175+7meV. The present results are in agreement with resonance strength upper limits set by previous direct measurements, as well as resonance energies inferred from precision (He3, t) charge exchange reactions. However, both the energy and strength of the 456 keV resonance disagree with a recent indirect study of the Ne19(d,n)Na20 reaction. In particular, the new Ne19(p,γ)Na20 reaction rate is found to be factors of 8 and 5 lower than the most recent evaluation over the temperature range of oxygen-neon novae and astrophysical x-ray bursts, respectively. Nevertheless, we find that the Ne19(p,γ)Na20 reaction is likely to proceed fast enough to significantly reduce the flux of F19 in nova ejecta and does not create a bottleneck in the breakout from the hot CNO cycles into the rp process.

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  • Received 24 August 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.242701

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

R. Wilkinson1, G. Lotay1,2, A. Lennarz3, C. Ruiz3, G. Christian4,5,6, C. Akers3,*, W. N. Catford1, A. A. Chen7, D. Connolly3, B. Davids3, D. A. Hutcheon3, D. Jedrejcic8, A. M. Laird9, L. Martin3, E. McNeice7, J. Riley9, and M. Williams3,9

  • 1Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
  • 2National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom
  • 3TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
  • 4Cyclotron Institute, Texas A&M University, College Station, Texas 77843-3366, USA
  • 5Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-3366, USA
  • 6Nuclear Solutions Institute, Texas A&M University, College Station, Texas 77843-3366, USA
  • 7Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
  • 8Colorado School of Mines, Golden, Colorado 80401, USA
  • 9Department of Physics, The University of York, York YO10 5DD, United Kingdom

  • *Present address: Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea.

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Vol. 119, Iss. 24 — 15 December 2017

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