Abstract
When a slow pion is absorbed in a nucleus by a single nucleon which takes all the available energy, the conservation of energy and momentum requires the nucleon to have a large momentum inside the nucleus before the absorption process. For a pion at rest this momentum would be 500 MeV/c, and it is known that not many nucleons have such high momenta. In the case of an absorption by a pair of nucleons, on the other hand, energy and momenta are easily balanced, the two nucleons going in opposite directions with a high relative momentum and a small momentum of their center of mass. The fact that the absorption by a pair of nucleons is favored makes pion absorption an ideal tool for the study of residual states with two holes in the internal shells.
Published Version
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