Electroproduction of negative pions on 15N leading to the ground state of 15O

Abstract

An angular distribution of negative pions produced on 15N, leading to the ground state of15O, has been measured via the (e, π−)-reaction at Ee ≈ 170 MeV. Using virtual photon theory, single-differential cross sections are extracted from the measured double-differential cross sections. The measured data is in good agreement with theoretical calculations in the DWIA model. A clear signature of nuclear EO excitation is found in contrast to previous experiments in a similar reaction on 13C.