Energy dependence of two-nucleon pion absorption on O16

S. D. Hyman, D. J. MacK, P. G. Roos, H. Breuer, N. S. Chant, F. Khazaie, B. G. Ritchie, J. D. Silk, G. S. Kyle, P. A. Amaudruz, C. H.Q. Ingram, D. Renker, R. A. Schumacher, U. Sennhauser, Th S. Bauer, W. J. Burger

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12 Scopus citations


Inclusive O16(π+,p) and exclusive O16(π+,2p) data are presented for 115 MeV and 165 MeV pions. Using a combination of distorted-wave impulse approximation (DWIA) calculations for two-nucleon absorption and phase space simulations for more complicated processes, the data are fit and the total direct two-nucleon absorption cross sections are extracted. These cross sections fall faster with energy than π+d→pp. The DWIA calculations were used to calculate the effects of final state interactions (FSI). After correcting for FSI, the two-nucleon absorption process is found to dominate at 115 MeV, becoming less important as the incident energy increases to 165 MeV. The decrease with energy in the two-nucleon fraction of the total absorption cross section is found to be in remarkably good agreement with theoretical predictions.

Original languageEnglish (US)
Pages (from-to)1184-1199
Number of pages16
JournalPhysical Review C
Issue number3
StatePublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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