Nuclear pion absorption in the Skyrme model
The description of pion absorption in nuclei in the Skyrme model is similar to that used in phenomenological meson theory. The main absorption mechanism can be described as a two-nucleon mechanism in which the initial pion is rescattered once prior to final absorption. The long range parts of the rescattering amplitudes for theS- andP-wave rescattering mechanisms have the conventional pion exchange form. The model predicts a strong increase of the isospin evenS-wave rescattering contribution to the absorption rate above threshold, which in the case of the deuteron would cause a rapid decrease of the netS-wave absorption rate with increasing pion energy.