Abstract
Inclusive energy spectra ( E ⩾ 20MeV) of neutrons, protons, and deuterons emitted after stopped π − absorption in 6Li, 9Be, 16O and 27Al (neutrons only) were measured. Single-neutron emission rates of the order of 10 −2 and 10 −3 per stopped pion were obtained for 6Li, 9Be, 16O and for 27Al respectively. The experimental data indicate a predominant contribution of two-nucleon absorption mechanism to the neutron and proton spectra for all the studied nuclei, and presence of direct deuterons from cluster-absorption for 6Li. Values of R np are deduced, which are consistent with predictions based on the absorption mechanism by a correlated pair of nucleons with pion rescattering.
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