Experiments on negative pion capture by light nuclei are a source of information on the role of nucleon clusters in light nuclei. In order to study some reactions with 8Li production in negative pion capture by light nuclei (C,N,O) the authors of the present paper have made an experiment using photoemulsion chambers at Dubna synchrocyclotron. The experimental arrangement has been described in ref. /1/. The reactions resulting in one-or two-prong σ-stars have been studied previously /1-3/. Here the results of the kinematic analysis of 3-prong σ-stars in photoemulsion are given in Table 1. As many as 1000 3-prong events have been measured and calculated according to the kinematic programme. The number of events corresponding to various reactions is given in the Table. For the events which do not satisfy the kinematics of the reaction with one neutron or without it the missing mass was calculated under the assumption that they should correspond to reactions 4,9,15. The result of the analysis shows that the number of events corresponding to various reactions is equal to the total number of the analysed events with statistical accuracy. This confirms the conclusion that practically all σ-stars having hammer tracks belong to reactions on light nuclei in photoemulsion. The obtained relative probability values are given in the Table.