The ' C(d, n) and ' C(d, n) cross sections have been measured for 0.2 E, 2. 1 MeV and 0.2~E, 1.3 MeV, respectively, using a 4~neutron detector. The cross sections are used to calculate the thermonuclear reaction rates for temperatures below 10 GK. The implications of these and other new nuclear-physics results for inhomogeneous primordial nucleosynthesis are discussed.PACS number(s): 25.45.Hi, 27.20. +n, 98.80.Ft