Abstract

The cross sections for neutron absorption by N/sup 14/, O/sup 17/ and Ne/ sup 21/ are given for 10, 15, and 60 kev neutron energies, and the products of the abundances expected in stellar interiors and the capture cross sections for 15 kev neutrons are listed. At low temperatures in stellar irteriors the neutron capture process, starting with Ne/sup 20/ as seed nucleus, is discussed and seen to progress in a cycle through Ne/sup 21/, O/sup 18/, O/sup 19/, F/sup 19/, F/sup 20/, back to Ne/sup 2 0/. This cyclic reaction is seen to establish a definite dynamic equilibrium between the species of atomic nuclei involved in the cycle. Abundance ratios of Ne/sup 20//Ne/sup 21/ and O/sup 18//F/sup 19/ are calculated and compared with observed ratios. Some possible neutron and heavy seed nuclei production processes are discussed. (H.D.R.)

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