Pion absorption in flight on 4He

M. Steinacher, G. Backenstoss, M. Izycki, P. Salvisberg, P. Weber, H. J. Weyer, A. Hoffart, B. Rzehorz, H. Ullrich, M. Dzemidzić, M. Furić, T. Petković

Research output: Contribution to journalArticle

37 Scopus citations


We have measured double and triple coincidences following π+ and π- absorption on 4He at various pion energies. Differential and integrated cross sections are determined for all possible absorption channels. We study and compare the two-nucleon absorption on nucleon pairs with isospin I = 0 and I = 1. In the dNN final-state two absorption mechanisms are identified, one with only one spectator nucleon and one with phase-space behavior. The existence of a three-nucleon absorption component with a spectator nucleon is established and a four nucleon phase-space-like contribution is also identified and found to be small. The total absorption cross section is directly determined by adding the integrated cross sections of all measured reaction channels.

Original languageEnglish (US)
Pages (from-to)413-454
Number of pages42
JournalNuclear Physics, Section A
Issue number3-4
StatePublished - Oct 29 1990
Externally publishedYes


  • Nuclear reactions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Steinacher, M., Backenstoss, G., Izycki, M., Salvisberg, P., Weber, P., Weyer, H. J., Hoffart, A., Rzehorz, B., Ullrich, H., Dzemidzić, M., Furić, M., & Petković, T. (1990). Pion absorption in flight on 4He. Nuclear Physics, Section A, 517(3-4), 413-454. https://doi.org/10.1016/0375-9474(90)90210-D