Excitation functions for the production ofF18andNa24from Al and Si with fast pions

1 October 1985

journal article
research article
Published by American Physical Society (APS) in Physical Review C

Vol. 32 (4) , 1305-1311
https://doi.org/10.1103/physrevc.32.1305

Abstract

The excitation functions for the pion-induced reactions Al27(π±,xN)18F, Al27(π±,xN)24Na, Si(π±,xN)18F, and Si(π±,xN)24Na have been determined for 50- to 390-MeV π+ and 50- to 500-MeV π−. These excitation functions will enable experimenters to monitor high-intensity pion beams by activation of readily available high-purity Al foils or Si disks. The four excitation functions for F18 production and the two for Na24 production by π+ show similar (3,3) resonance patterns. However, those for Na24 production by π− are strikingly different in that the cross sections remain large from the resonance energy on down. This feature is attributed to increasing contributions from π− absorption and charge exchange with decreasing energy.

Keywords

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