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Neutron capture cross sections are averaged over Maxwell -Boltzmann neutron distributions for temperatures pertinent to slow nucleosynthesis (s process) in red giant stars. Such cross sections, together with isotopic abundances, provide the major quantitative experimental tests of the theory.The cross sections are tabulated at convenient intervals from kÃ=5 keV to kT =90 keV where data are available. In many cases it has been possible to supplement the often fragmentary {as of June 1964) data with evidence from nuclear systematics.

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1319/ of high angular momentum states in the region A 130 can be observed by heavy ion reactions. In the region of A 25 high angular momenta states should be formed by such reactions as B" (0", P) Mg".Finally the new state in Al" at 4.047&0.010 Mev corresponds closely in energy to a state in Mg" at 4.052&0.010 Mev. A comparison of these mirror nuclei including all the information available to date has been published. " England for supplying the Mg" targets on special backings, to Miss A. R. Rutledge for her computational assistance and to Mr. P. Ashbaugh and the operating staff of the Chalk River Electrostatic Accelerator for the reliable operation of the accelerator.Measurements have been made of the photoneutron cross section for Be' using p rays from radioactive sources of Y" (1.85 Mev) and Sb"4 (1.69 Mev). The values obtained at these two energies are (6.54+0.31) X10 " cm' and (12.62+0.69))&10 " cm', respectively. The limiting factors in the accuracy of these measurements are the uncertainties in the p-ray source strength calibration and in the NBS No. 2 Ra-p-Be neutron source standard, and the lack of precise knowledge concerning the Sb"4 decay scheme. A new measurement of the p-ray branching ratios in the Sb"4 decay has also been made.