Nuclear Reactions of Low- Z Elements with 5.7-Bev Protons

The results of 5.7-Rev proton bombardments of the target elements Re, C, N, O, F, Na, and Al are described. Production cross sections were obtainad for many radioactive products with half-lives of 1.2 minutes to 2.6 years. The (p,pn) cross sections for the tangets C, N, O, F, and Na were found to be 29 combination rat 3, 7.3 combination rat 0.7, 33 combination rat 5, 19 combination rat 2, a331 combination rat 5 mb, respectively. Much of the variation in these values is thought to be due to the difference in the number of neutrons available for (p,pn) reactions in the different target nuclei. The cross sections for other types of reactions studied do not change as much over the above range of tanget elements as do the (p,pn) cross sections. Comparison of these cross sections with those obtained at 0.98 to3 Rev shows that in the 1- to 5.7-Rev energy range the excitation functions are nearly constant. (auth)