We have studied the low-energy ${}_{}{}^2{}_{}{}^{}\mathrm{H}$(d,γ${)\mathrm{}}^4$He reaction based on a microscopic description of the nuclear wave functions. Our study reproduces the experimental reaction cross sections at E≤3 MeV; it allows for an extrapolation of the data to energies relevant for big-bang nucleosynthesis resulting in a cross section about 35 times higher than given in present compilations. Our results indicate a D-state admixture in the ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ ground state of ≊5–7 %.

• Received 9 June 1986

DOI:https://doi.org/10.1103/PhysRevC.36.17