Abstract
From an analysis of 12 ‘clean’ pion tridents produced in 17.2 GeV/c π−-interactions in emulsion nuclei, the distributions of the longitudinal and transverse momentum of recoil nuclei are obtained. The distribution of transverse momentum of recoil nuclei for the combined data of Caforioet al., Azimovet al., and the present experiment is compared with the expected curves for various assumptions. It is demonstrated that the best fit is for the assumptions (a) only light nuclei contribute to the coherent process and (b) all nuclei contribute equally. It is stressed that the conclusion of Caforioet al., that the light nuclei do not play an important role is based on the discrepancy between the observed and expected mean free path which is critically hinged on the cross-section obtained in the heavy liquid bubble chamber—a cross-section whose value is uncertain.
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