Conclusion
All the above features fit well into the assumption that the backward π-mesons are the decay products of isobars formed by the target nucleons. Experimental evidence tentatively suggests that there is a fair contribution to the isobars from masses higher than that of the (3/2, 3/2) state of the nucleon.
More statistics on the energy spectrum, charge ratio, a ngular distribution andPT distribution of these π-mesons will give important information about the production of isobars in cosmic-ray jets.
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References
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This work has been supported by the Nuclear Research Foundation within the University of Sydney and by the Air Force Office of Scientific Research under grant AF-AFOSR-305-63.
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Imaeda, K., Kazuno, M., Peak, L.S. et al. Emission of π-mesons in the backward hemisphere in the l.s. of cosmic-ray jets. Nuovo Cimento A (1965-1970) 43, 206–209 (1966). https://doi.org/10.1007/BF02753198
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DOI: https://doi.org/10.1007/BF02753198