Journal article
Multi-nucleon pion absorption in the 4He(π , ppp)n reaction
P Weber, J McAlister, R Olszewski, A Feltham, M Hanna, D Humphrey, RR Johnson, GJ Lolos, Y Mardor, S May-tal, D Ottewell, Z Papandreou, M Pavan, C Ponting, FM Rozon, M Sevior, G Sheffer, GR Smith, V Sossi, R Tacik Show all
Physics Letters B | ELSEVIER SCIENCE BV | Published : 1989
Abstract
Three-proton emission cross sections for the 4He(π+, ppp)n reaction were measured at Tπ+=165 MeV over a wide angular range in a kinematically complete experiment. The momentum distribution of the undetected neutron and angular correlations have been compared with three- and four-body phase space Monte Carlo calculations. The results indicate that most of the three-proton coincidences result from three nucleon absorption. The total three-nucleon absorption cross section is estimated to be σ3N=4.5±1.0 mb from phase-space integration. This cross section does not account for the discrepancy between total absorption cross sections and two-nucleon absorption cross sections. © 1989.