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Published April 21, 1980 | public
Journal Article Open

How many nucleons are involved in pion absorption in nuclei?


The proton yields from the interaction of pions on nuclear targets with 12<~A<~181 were measured in the region of the Δ(3, 3) resonance. The shift in proton energies with angle is analyzed in terms of the average number of nucleons that have participated in absorbing the pion's momentum and total energy. The effective number of interacting nucleons, for both π+ and π- incident, is found to be ∼3 for 12C and increasing to ∼5.5 for 181Ta. These effective numbers of nucleons are also consistent with the ratio of proton yields from π+- and π--induced reactions.

Additional Information

©1980 The American Physical Society. Received 30 January 1980. The authors would like to thank J. Worthington for his help in setting up the experiment and J. Groner and G. Pulawski for their assistance in the data reduction. This work was performed under the auspices of the U. S. Department of Energy.


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