Polarized and unpolarized $d+d\to n+{}_{}{}^3{}_{}{}^{}\mathrm{He}$ fusion reaction cross sections in the center-of-mass energy region of 20-150 keV are calculated in a distorted-wave Born approximation. The calculated unpolarized cross sections and the anisotropy of the angular distributions are within 20% of the experimental data. The polarized cross sections are found to be Å7.7% of the unpolarized ones despite the inclusion of the $D$-state component in ${}_{}{}^3{}_{}{}^{}\mathrm{He}$. This shows that the idea of a "neutronlean" reactor may still be feasible.

• Received 17 October 1985

DOI:https://doi.org/10.1103/PhysRevLett.57.1410