Gamma-ray production cross sections have been measured for the gamma-ray lines most strongly excited in the proton bombardment of "C, "N, ' 0, ' Ne, "Mg, "Si, and '6Fe, for proton energies from threshold to 23 MeV. I addition, cross sections for the "N(p, n) "0 and "Fe(p,n)"Co reactions were determined from delayed gamma-ray yields. Ge(Li) detectors were used. Tabulations of cross sections averaged over proton energy bins of 1 MeV and over power law distributions in proton energy are provided for calculations relevant to gamma-ray line astronomy.Examples are given of astrophysical information which might be extracted from spectra acquired with gamma-ray spectrometers in space, using these cross sections, e.g. , parameters describing the energy distribution of incident protons.NUCLEAR REACTIONS p+'2C, '4N,~~0, Ne, 24Mg 288i +Fe t4N(P n) +Fe(p, n j. E= threshold to 23 MeV. Measured y production cross sections.Applications to y line astronomy.

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