Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-06-27
Phys.Rev.C63:024003,2001
Physics
Nuclear Physics
Nuclear Theory
18 pages, 10 figures, final Phys. Rev. C version, calculation improved over original version
Scientific paper
10.1103/PhysRevC.63.024003
We have computed the cross section for the process d + alpha -> 6Li + gamma 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 v_18 and Urbana IX potentials, including improved treatment of large-particle-separation behavior. The initial state is built up from the alpha-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.
Nollett Kenneth M.
Schiavilla Rocco
Wiringa R. B.
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