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Abstr&-Photoionizotion and photoabsorption orosa sootione for Ng, 04 and 0 ~p8 p~~entod in B form useful for calaulation of solar EUV absorption and photo&&on production. The croos s&ions axe based mostly on the d&a presented in the reviews by SUEOEN (1969) and Hurm (1969).

We measured the differential production cross section for producing pions in 12.2-GeV/c p-p collisions on lines of fixed P j and P ± in the cm. system. We found that d 2 cr/ dQdp is maximum at Pj =0, in disagreement with our earlier result, which supported the two-center model. We have evidence that the earlier result is wrong. It also appears that in the cm. system, d 2 a/d£ldp is factorable into functions of Pj and P±. In the P ± dependence we found a very sharp forward peak of the form e ~l bP ± .

We measured the differential cross section for 12.4-GeV/c proton-proton inelastic scattering on circles of fixed energy loss in the cm. system. We varied the inelasticity from 8 to 94% and covered much of the angular range. For essentially all inelasticities the dependence on Pj^ is approximately e"^^-^ . The absolute value of (fu/dQdp also depends only weakly on energy loss.