Six-body calculation of the α-deuteron radiative capture cross section

Phys. Rev. C 63, 024003 – Published 23 January 2001
K. M. Nollett, R. B. Wiringa, and R. Schiavilla

Abstract

We have computed the cross section for the process d(α,γ)6Li at the low energies relevant for primordial nucleosynthesis and comparison with laboratory data. The final state is a six-body wave function generated by the variational Monte Carlo method from the Argonne v18 and Urbana IX potentials, including improved treatment of large-particle-separation behavior. The initial state is built up from the α-particle and deuteron ground-state solutions for these potentials, with phenomenological descriptions of scattering and cluster distortions. The dominant E2 cross section is in reasonable agreement with the laboratory data. Including center-of-energy and other small corrections, we obtain an E1 contribution which is larger than the measured contribution at 2 MeV by a factor of 7. We calculate explicitly the impulse-approximation M1 contribution, which is expected to be very small, and obtain a result consistent with zero. We find little reason to suspect that the cross section is large enough to produce significant 6Li in the big bang.

DOI: http://dx.doi.org/10.1103/PhysRevC.63.024003

  • Received 27 June 2000
  • Published 23 January 2001

© 2001 The American Physical Society

Authors & Affiliations

K. M. Nollett

  • Department of Physics, Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637-1433
  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

R. B. Wiringa

  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

R. Schiavilla

  • Jefferson Lab, Newport News, Virginia 23606
  • Department of Physics, Old Dominion University, Norfolk, Virginia 23529

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