Abstract
We discuss a new mechanism by which pions are absorbed in a single-step process on three correlated nucleons in 3He and 4He, leading to three nucleons which share the pion energy comparably. The mechanism invokes quark degrees of freedom in nuclei, with a small probability of about 6% in He, but nevertheless leads to cross-sections of several millibarns. Comparison is made to recent experiments, and to conventional mechanisms.
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