Elsevier

Nuclear Physics A

Volume 806, Issues 1–4, 15 June 2008, Pages 216-229
Nuclear Physics A

Pion emission in 2H, 12C, 27Al(γ,π+) reactions at threshold

https://doi.org/10.1016/j.nuclphysa.2008.02.308Get rights and content

Abstract

The very first data from MAX-lab in Lund, Sweden on pion photoproduction at threshold energies are presented. The decrease of the total π+ yield in γ+12C, 27Al reactions below 200 MeV as well as the dσ/dΩ cross-section data essentially follow the predictions of an intranuclear-cascade model with an attractive potential for the pion–nucleus interaction. However, d2σ/dΩdT, cross-section data at 176 MeV show deviations which call for refinements of the model and possibly also for the inclusion of coherent pion-production mechanisms.

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