Excitation of giant electric isovector resonances in pion charge exchange reactions

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Abstract
Pion single charge-exchange reactions exciting giant electric isovector resonances are studied for a series of nuclei. The reaction mechanism is treated in the distorted-wave impulse approximation. Emphasis is put on the nuclear structure aspects probed in these reactions. Transition densities for charge-exchange excitations are calculated using the sum-rule method and microscopically, in the Hartree-Fock—random-phase-approximation framework. The resulting cross sections are sensitive to the nuclear structure input. Double differential cross sections as functions of the nuclear excitation energy are calculated.