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Ground-State Proton Decay of Br69 and Implications for the Se68 Astrophysical Rapid Proton-Capture Process Waiting Point

A. M. Rogers, M. A. Famiano, W. G. Lynch, M. S. Wallace, F. Amorini, D. Bazin, R. J. Charity, F. Delaunay, R. T. de Souza, J. Elson, A. Gade, D. Galaviz, M.-J. van Goethem, S. Hudan, J. Lee, S. Lobastov, S. Lukyanov, M. Matoš, M. Mocko, H. Schatz, D. Shapira, L. G. Sobotka, M. B. Tsang, and G. Verde
Phys. Rev. Lett. 106, 252503 – Published 24 June 2011

Abstract

We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus Br69. Bypassing the Se68 waiting point in the rp process is directly related to the 2p-capture rate through Br69, which depends exponentially on the proton separation energy. We find a proton separation energy for Br69 of Sp(Br69)=78540+34keV; this is less bound compared to previous predictions which have relied on uncertain theoretical calculations. The influence of the extracted proton separation energy on the rp process occurring in type I x-ray bursts is examined within the context of a one-zone burst model.

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  • Received 17 December 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.252503

© 2011 American Physical Society

Authors & Affiliations

A. M. Rogers1,2,3,*, M. A. Famiano4,3, W. G. Lynch1,5,3, M. S. Wallace6, F. Amorini7, D. Bazin1, R. J. Charity8, F. Delaunay9, R. T. de Souza10, J. Elson8, A. Gade1,5, D. Galaviz1,3, M.-J. van Goethem11, S. Hudan10, J. Lee1, S. Lobastov12, S. Lukyanov12, M. Matoš1,3, M. Mocko6, H. Schatz1,5,3, D. Shapira13, L. G. Sobotka8, M. B. Tsang1, and G. Verde14

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Physics Division, Argonne National Laboratory, Argonne, Illinois, 60439 USA
  • 3Joint Institute of Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
  • 4Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
  • 5Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 6Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 7Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud, Catania, I-95123, Italy
  • 8Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
  • 9LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen, France
  • 10Indiana University Cyclotron Facility and Department of Chemistry, Bloomington, Indiana 47405, USA
  • 11Kernfysisch Versneller Instituut, NL-9747 AA Groningen, The Netherlands
  • 12FLNR/JINR, 141980 Dubna, Moscow region, Russian Federation
  • 13Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 14Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Catania, I-95123, Italy

  • *amrogers@phy.anl.gov

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Vol. 106, Iss. 25 — 24 June 2011

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