Excitation of A isobars in single pion charge exchange at 1 GeV
Golubeva M. B. , Kovinskii V. I. , Krasnov V. A. , Kurepin A. B. , Patarakin O. O., Prokhvatilov M. A. , Reshetin A. I. , Topil'skaya N. S. , Shul'ginov A. V.
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.