Study of Elastic (π-p) and Coherent (π-C) Cross-Section at 40 GeV/c Using Propane (C3H8) Bubble Chamber

Two independent methods have been made to determine the elastic (π - p) and coherent production (π - C) cross-sections. Firstly, we have estimated these cross-sections from the distribution of number of γ-quanta associated with the 2 to 5-prong π - p and π - n events. The second method is based on multiplicity distribution of charged secondaries in π - p and π - n interactions. The experiment was performed by exposing a 2m propane (C 3 H 8 ) bubble chamber to a π - -meson beam at p=40 GeV/c at Serpukhov.