Abstract

We report on the pion single charge exchange program at LAMPF. The LAMPF π° spectrometer is described and its successful performance in this first data run is discussed. Results on the excitation of the isobaric analog state (IAS) in pion single charge exchange at forward angles are presented. The IAS was observed for nuclei throughout the periodic table. The mass and energy dependence of the forward angle differential cross section is discussed. An angular distribution for the reaction 3He( π −, π°) 3H at angles from 0° to 84° at a bombarding energy of 200 MeV is presented. The data indicate a substantial contribution from the spin-flip amplitude. An angular distribution for the 13 c( π +, π°) 13N (IAS) reaction for angles from 0° to 45° at a bombarding energy of 150 MeV is presented. The partial angle integrated cross section ( θ < 45°) is given.

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