Abstract
The emission of pions and protons in interactions between heavy nuclei from the cosmic radiation (12≦Z≦26) and photoemulsion nuclei has been studied. The angular and energy distributions of target protons are similar to corresponding distributions in proton-nucleus interactions for emission angles >30°. In heavy ion interactions a forward peak of high energy target protons (E>200 MeV)is observed. The energy spectrum of target protons for angles <30° is remarkably flat for heavy ion interactions.
For increasing disintegration of the target nucleus the number of produced pions per emitted recoil target proton is almost constant in heavy ion interactions, while it decreases rapidly in proton-nucleus interactions. The logtgΘ distributions of pions have small standard deviations even in interactions with a large target disintegration.
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We are grateful to the U.S. Office of Naval Research for the exposure of the emulsion stacks. Thanks are also due to Miss B. Lindkvist for the processing of the emulsions. The financial support from the Swedish Atomic Research Council is gratefully acknowledged.
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Jakobsson, B., Kullberg, R. & Otterlund, I. Pion and proton emission in interactions induced by relativistic heavy nuclei withZ≧12. Z Physik A 272, 159–168 (1975). https://doi.org/10.1007/BF01408143
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DOI: https://doi.org/10.1007/BF01408143