Multi-nucleon pion absorption in the 4He(π+, ppp)n reaction

P. Weber*, J. McAlister, R. Olszewski, A. Feltham, M. Hanna, D. Humphrey, R. R. Johnson, G. J. Lolos, Y. Mardor, S. May-tal, D. Ottewell, Z. Papandreou, M. Pavan, C. Ponting, F. M. Rozon, M. Sevior, G. Sheffer, G. R. Smith, V. Sossi, R. TacikD. Vetterli

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalPhysics Letters B
Issue number1-2
StatePublished - 26 Oct 1989


FundersFunder number
National Sciences and Engineering Research Council of Canada
US-Israel Blnational Science Foundation


    Dive into the research topics of 'Multi-nucleon pion absorption in the 4He(π+, ppp)n reaction'. Together they form a unique fingerprint.

    Cite this