Infrared and ultraviolet observations of nova light curves have confirmed grain formation in their expanding shells that are ejected into the interstellar medium by a thermonuclear runaway. In this paper, we present isotopic ratios

The halo effect in the final states of astrophysically relevant direct neutron–capture reactions by neutron–rich nuclei is discussed. As an example, we calculate the cross sections for O(n,γ)O at thermonuclear and thermal energies.