Abstract
We attempt to explain threshold pion absorption in nuclei using simple pion rescattering mechanicsms. While the model is successful in the case of the deuteron it leads to 10-30% too small absorption rates in other nuclei. We also study a $\ensuremath{\rho}\ensuremath{\omega}$ exchange absorption mechanism that does not act in the deuteron, but find that it can only remove a small part of the remaining discrepancy. The two-nucleon absorption mechanism accounts for 75% of the imaginary part of the $S$-wave pion nucleus optical potential.NUCLEAR REACTIONS Pion absorption calculated at threshold in light nuclei $^{2}\mathrm{H}$, $^{4}\mathrm{He}$, $^{12}\mathrm{C}$, $^{16}\mathrm{O}$, $^{20}\mathrm{Ne}$, and nuclear matter.
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