Dominance of the two-nucleon mechanism in O16(+,pp) at 115 MeV

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

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Singles O16(+,p) and coincidence O16(+,2p)14N measurements have been made at T=115 MeV over an extended range of the phase space of the two final-state protons. The coincidence measurements have a missing-mass resolution of 4 MeV. The direct two-nucleon absorption cross section extracted from the data is 58±8 mb. After corrections for final-state interactions, it was found that the two-nucleon ++nppp process accounts for about 76% of the total absorption cross section, and thus is the dominant absorption mechanism. Evidence for absorption on s-p pairs is seen as a broad bump near 32 MeV of excitation. At backward angles the inclusive O16(+,p) spectra show a distinct absorption peak, an important feature not previously observed. Comparisons of distorted wave impulse approximation calculations to both the coincidence data and inclusive data are presented.

Original languageEnglish (US)
Pages (from-to)1767-1783
Number of pages17
JournalPhysical Review C
Issue number4
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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