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.
ASJC Scopus subject areas
- Nuclear and High Energy Physics