We have computed the cross section for the process 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 and Urbana IX potentials, including improved treatment of large-particle-separation behavior. The initial state is built up from the -particle and deuteron ground-state solutions for these potentials, with phenomenological descriptions of scattering and cluster distortions. The dominant cross section is in reasonable agreement with the laboratory data. Including center-of-energy and other small corrections, we obtain an contribution which is larger than the measured contribution at 2 MeV by a factor of 7. We calculate explicitly the impulse-approximation 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 in the big bang.
- Received 27 June 2000
- Published 23 January 2001
© 2001 The American Physical Society