EXTRACTION OF THE SPECTRAL FUNCTIONS OF THE VIRTUAL DECAYS ALPHA-]TP AND ALPHA-]TAU-N FROM DATA ON THE REACTIONS ALPHA-P-]TPP AND ALPHA-P-]TAU-PN FOR INCIDENT ALPHA-PARTICLE MOMENTUM 2.7 GEV C/

A 2-m liquid-hydrogen bubble chamber was exposed to a separated beam o f alpha particles from the ITEP synchrotron. The momentum of the incid ent He-4 nuclei, averaged over the fiducial volume of the chamber, was 2.7 GeV/c (the kinetic energy of the incident protons in the rest fra me of the nucleus was T(p) = 220 MeV). The spectral functions for the decays alpha --> tp and alpha --> taun, extracted from the exclusive r eactions alphap --> tpp and alphap --> taupn, are identical within the experimental errors. By extrapolating the nuclear vertex function to the pole a lower bound is obtained for the corresponding vertex consta nt. The experimental data are compared with the results of other studi es and with theoretical calculations.