Pion absorption in C-12

19We have studied the two reactions 12C(π+,pp) and 12C(π+,ppp) in one experiment, using the CHAOS spectrometer at TRIUMF, at incident pion energies of 200, 240, and 280 MeV. In both cases, we are able to distinguish between reaction mechanisms involving only the detected protons, and those in which additional nucleons must have participated, on the basis of missing momentum. In the case of 12C(π+,ppp), we identify events due to the two step process of π+p quasielastic scattering followed by two-nucleon absorption. Estimates are made for the total cross sections for the various absorption mechanisms.nonenoneR. Tacik; F. Farzanpay; E. L. Mathie; P. Amaudruz; J. T. Brack; L. Felawka; R. Meier; D. Ottewell; and G. R. Smith; G. Hofman; M. Kermani; S. McFarland; K. Raywood; M. Sevior; F. Bonutti; P. Camerini; N. Grion; R. Rui; E. F. GibsonR., Tacik; F., Farzanpay; E. L., Mathie; P., Amaudruz; J. T., Brack; L., Felawka; R., Meier; D., Ottewell; G. R., Smith; G., Hofman; M., Kermani; S., Mcfarland; K., Raywood; M., Sevior; Bonutti, Faustino; Camerini, Paolo; N., Grion; Rui, Rinaldo; E. F., Gibso

Contribution of the elastic radiative tail to the deep inelastic muon scattering on heavy targets

Improvement of the radiative correction scheme for the deep inelastic scattering on the heavy targets is discussed. Arguments that the contribution of the radiative tail from the elastic peak should be calculated without use of the Born approximation in the case of the heavy target scattering are presented. The semianalytical approach based on the classical solution of the old bremsstrahlung problem is shortly described. The numerical results for the new correction factor are presented for the scattering on tin and lead.Comment: 19 pages e-mail: [email protected]