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VOLUME 51 (1990) | ISSUE 6 | PAGE 298
Excitation of A isobars in single pion charge exchange at 1 GeV
A peak corresponding to a nuclear excitation energy of about 300 MeV has been discovered in the spectra of π° mesons from the (π ~, π°) reaction with carbon and aluminum nuclei at an angle of 10°. This peak is interpreted as a manifestation of a Δ33 isobar in the nucleus. It lies at an excitation energy lower than that for the (77+ ,7T°) reaction with a free proton.