${\pi }^{+}{+}^{12}\mathrm{C}$ elastic scattering between 18 and 44 MeV

Differential cross sections for ${\pi }^{+}{+}^{12}\mathrm{C}$ elastic scattering in the energy range of 18–44 MeV for six scattering angles have been measured with an increment in the incident energy of 2 MeV. The measured cross sections are compared to calculations within the framework of a unitary scattering theory of the pion-nucleus interaction. It is shown that the excitation function at angles around $90°$ is dominated by the $D$ wave of the pion-nucleus interaction.