Astrophysical S factor of 3He(α,γ)7Be

A. Kontos, E. Uberseder, R. deBoer, J. Görres, C. Akers, A. Best, M. Couder, and M. Wiescher
Phys. Rev. C 87, 065804 – Published 28 June 2013

Abstract

Background: The 3He(α,γ)7Be reaction is important for the neutrino production in the sun's core and the production of 7Li during big bang nucleosynthesis. The reaction mechanism is characterized by a strong direct capture component and nearby broad unbound resonance levels.

Purpose: Recent experiments have opened up a new energy window into the reaction mechanism and it becomes more and more evident that, in order to understand the shape of the S factor, theoretical calculations need to take into account possible resonance contributions from higher energies as well.

Method: In the present work, a relatively wide energy window was investigated, Ec.m.=300–1460 keV, by detecting the prompt γ rays from the reaction. An extensive R-matrix analysis was performed, utilizing all modern literature capture data, as well as elastic scattering data, which are important in constraining some R-matrix parameters.

Results: The new experimental data agree very well with the modern literature data. The final result from the R-matrix fit gives a zero-energy S factor of S(0)=0.554(20) keV b. A table with the newly calculated reaction rate is given.

Conclusions: The simultaneous R-matrix analysis of the 3He(α,γ)7Be and 3He(α,α)3He channels yielded a reliable fit, consistent with all the included experimental data sets. In order to further constrain the reaction rate within the R-matrix framework, additional high-energy capture data, γ-ray angular distributions, and the inclusion of other relevant reaction channels are necessary.

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  • Received 4 April 2013
  • Corrected 3 July 2013
  • Corrected 17 July 2013

DOI:https://doi.org/10.1103/PhysRevC.87.065804

©2013 American Physical Society

Corrections

3 July 2013

17 July 2013

Errata

Publisher's Note: Astrophysical S factor of 3He(α,γ)7Be [Phys. Rev. C 87, 065804 (2013)]

A. Kontos, E. Uberseder, R. deBoer, J. Görres, C. Akers, A. Best, M. Couder, and M. Wiescher
Phys. Rev. C 88, 019904 (2013)

Publisher's Note: Astrophysical S factor of 3He(α,γ)7Be [Phys. Rev. C 87, 065804 (2013)]

A. Kontos, E. Uberseder, R. deBoer, J. Görres, C. Akers, A. Best, M. Couder, and M. Wiescher
Phys. Rev. C 88, 019906 (2013)

Authors & Affiliations

A. Kontos1,2,*, E. Uberseder1, R. deBoer1, J. Görres1, C. Akers1,3,†, A. Best1,‡, M. Couder1, and M. Wiescher1

  • 1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 2The Joint Institute for Nuclear Astrophysics, National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48823, USA
  • 3Department of Physics, University of Surrey, Guildford, Surrey, England

  • *kontos@nscl.msu.edu
  • Present address: Department of Physics, University of York, York YO10 5DD, UK and TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
  • Present address: Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

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Issue

Vol. 87, Iss. 6 — June 2013

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